diff --git a/applications/bad_usb/bad_usb_app.c b/applications/bad_usb/bad_usb_app.c
index 8f806f9f..eb647e00 100644
--- a/applications/bad_usb/bad_usb_app.c
+++ b/applications/bad_usb/bad_usb_app.c
@@ -79,12 +79,18 @@ BadUsbApp* bad_usb_app_alloc(char* arg) {
 
     view_dispatcher_attach_to_gui(app->view_dispatcher, app->gui, ViewDispatcherTypeFullscreen);
 
-    if(*app->file_name != '\0') {
-        scene_manager_next_scene(app->scene_manager, BadUsbSceneWork);
-    } else if(bad_usb_check_assets()) {
-        scene_manager_next_scene(app->scene_manager, BadUsbSceneFileSelect);
-    } else {
+    if(furi_hal_usb_is_locked()) {
+        app->error = BadUsbAppErrorCloseRpc;
         scene_manager_next_scene(app->scene_manager, BadUsbSceneError);
+    } else {
+        if(*app->file_name != '\0') {
+            scene_manager_next_scene(app->scene_manager, BadUsbSceneWork);
+        } else if(bad_usb_check_assets()) {
+            scene_manager_next_scene(app->scene_manager, BadUsbSceneFileSelect);
+        } else {
+            app->error = BadUsbAppErrorNoFiles;
+            scene_manager_next_scene(app->scene_manager, BadUsbSceneError);
+        }
     }
 
     return app;
diff --git a/applications/bad_usb/bad_usb_app_i.h b/applications/bad_usb/bad_usb_app_i.h
index 5772725d..67f5816b 100644
--- a/applications/bad_usb/bad_usb_app_i.h
+++ b/applications/bad_usb/bad_usb_app_i.h
@@ -18,6 +18,11 @@
 #define BAD_USB_APP_EXTENSION ".txt"
 #define BAD_USB_FILE_NAME_LEN 40
 
+typedef enum {
+    BadUsbAppErrorNoFiles,
+    BadUsbAppErrorCloseRpc,
+} BadUsbAppError;
+
 struct BadUsbApp {
     Gui* gui;
     ViewDispatcher* view_dispatcher;
@@ -26,6 +31,7 @@ struct BadUsbApp {
     DialogsApp* dialogs;
     Widget* widget;
 
+    BadUsbAppError error;
     char file_name[BAD_USB_FILE_NAME_LEN + 1];
     BadUsb* bad_usb_view;
     BadUsbScript* bad_usb_script;
diff --git a/applications/bad_usb/scenes/bad_usb_scene_error.c b/applications/bad_usb/scenes/bad_usb_scene_error.c
index 52650022..c8e1c361 100644
--- a/applications/bad_usb/scenes/bad_usb_scene_error.c
+++ b/applications/bad_usb/scenes/bad_usb_scene_error.c
@@ -1,7 +1,7 @@
 #include "../bad_usb_app_i.h"
 
 typedef enum {
-    SubghzCustomEventErrorBack,
+    BadUsbCustomEventErrorBack,
 } BadUsbCustomEvent;
 
 static void
@@ -10,23 +10,33 @@ static void
     BadUsbApp* app = context;
 
     if((result == GuiButtonTypeLeft) && (type == InputTypeShort)) {
-        view_dispatcher_send_custom_event(app->view_dispatcher, SubghzCustomEventErrorBack);
+        view_dispatcher_send_custom_event(app->view_dispatcher, BadUsbCustomEventErrorBack);
     }
 }
 
 void bad_usb_scene_error_on_enter(void* context) {
     BadUsbApp* app = context;
 
-    widget_add_icon_element(app->widget, 0, 0, &I_SDQuestion_35x43);
-
-    widget_add_string_multiline_element(
-        app->widget,
-        81,
-        4,
-        AlignCenter,
-        AlignTop,
-        FontSecondary,
-        "No SD card or\napp data found.\nThis app will not\nwork without\nrequired files.");
+    if(app->error == BadUsbAppErrorNoFiles) {
+        widget_add_icon_element(app->widget, 0, 0, &I_SDQuestion_35x43);
+        widget_add_string_multiline_element(
+            app->widget,
+            81,
+            4,
+            AlignCenter,
+            AlignTop,
+            FontSecondary,
+            "No SD card or\napp data found.\nThis app will not\nwork without\nrequired files.");
+    } else if(app->error == BadUsbAppErrorCloseRpc) {
+        widget_add_string_multiline_element(
+            app->widget,
+            63,
+            10,
+            AlignCenter,
+            AlignTop,
+            FontSecondary,
+            "Disconnect from\ncompanion app\nto use this function");
+    }
 
     widget_add_button_element(
         app->widget, GuiButtonTypeLeft, "Back", bad_usb_scene_error_event_callback, app);
@@ -39,7 +49,7 @@ bool bad_usb_scene_error_on_event(void* context, SceneManagerEvent event) {
     bool consumed = false;
 
     if(event.type == SceneManagerEventTypeCustom) {
-        if(event.event == SubghzCustomEventErrorBack) {
+        if(event.event == BadUsbCustomEventErrorBack) {
             view_dispatcher_stop(app->view_dispatcher);
             consumed = true;
         }
diff --git a/applications/debug_tools/usb_mouse.c b/applications/debug_tools/usb_mouse.c
index 93550bec..1468f6c6 100644
--- a/applications/debug_tools/usb_mouse.c
+++ b/applications/debug_tools/usb_mouse.c
@@ -42,7 +42,8 @@ int32_t usb_mouse_app(void* p) {
     ViewPort* view_port = view_port_alloc();
 
     FuriHalUsbInterface* usb_mode_prev = furi_hal_usb_get_config();
-    furi_hal_usb_set_config(&usb_hid, NULL);
+    furi_hal_usb_unlock();
+    furi_check(furi_hal_usb_set_config(&usb_hid, NULL) == true);
 
     view_port_draw_callback_set(view_port, usb_mouse_render_callback, NULL);
     view_port_input_callback_set(view_port, usb_mouse_input_callback, event_queue);
diff --git a/applications/gpio/gpio_app.c b/applications/gpio/gpio_app.c
index 489c9854..7dfce836 100644
--- a/applications/gpio/gpio_app.c
+++ b/applications/gpio/gpio_app.c
@@ -51,6 +51,10 @@ GpioApp* gpio_app_alloc() {
     view_dispatcher_add_view(
         app->view_dispatcher, GpioAppViewGpioTest, gpio_test_get_view(app->gpio_test));
 
+    app->widget = widget_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, GpioAppViewUsbUartCloseRpc, widget_get_view(app->widget));
+
     app->gpio_usb_uart = gpio_usb_uart_alloc();
     view_dispatcher_add_view(
         app->view_dispatcher, GpioAppViewUsbUart, gpio_usb_uart_get_view(app->gpio_usb_uart));
@@ -73,7 +77,9 @@ void gpio_app_free(GpioApp* app) {
     view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewGpioTest);
     view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUart);
     view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUartCfg);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUartCloseRpc);
     variable_item_list_free(app->var_item_list);
+    widget_free(app->widget);
     gpio_test_free(app->gpio_test);
     gpio_usb_uart_free(app->gpio_usb_uart);
 
diff --git a/applications/gpio/gpio_app_i.h b/applications/gpio/gpio_app_i.h
index b288794d..fa91e8f7 100644
--- a/applications/gpio/gpio_app_i.h
+++ b/applications/gpio/gpio_app_i.h
@@ -12,6 +12,7 @@
 #include <gui/modules/submenu.h>
 #include <notification/notification_messages.h>
 #include <gui/modules/variable_item_list.h>
+#include <gui/modules/widget.h>
 #include "views/gpio_test.h"
 #include "views/gpio_usb_uart.h"
 
@@ -20,6 +21,7 @@ struct GpioApp {
     NotificationApp* notifications;
     ViewDispatcher* view_dispatcher;
     SceneManager* scene_manager;
+    Widget* widget;
 
     VariableItemList* var_item_list;
     GpioTest* gpio_test;
@@ -32,4 +34,5 @@ typedef enum {
     GpioAppViewGpioTest,
     GpioAppViewUsbUart,
     GpioAppViewUsbUartCfg,
+    GpioAppViewUsbUartCloseRpc,
 } GpioAppView;
diff --git a/applications/gpio/gpio_custom_event.h b/applications/gpio/gpio_custom_event.h
index 1682dc0f..cae36035 100644
--- a/applications/gpio/gpio_custom_event.h
+++ b/applications/gpio/gpio_custom_event.h
@@ -6,5 +6,7 @@ typedef enum {
     GpioStartEventManualConrol,
     GpioStartEventUsbUart,
 
+    GpioCustomEventErrorBack,
+
     GpioUsbUartEventConfig,
 } GpioCustomEvent;
diff --git a/applications/gpio/scenes/gpio_scene_config.h b/applications/gpio/scenes/gpio_scene_config.h
index 925f4c5c..3406e42d 100644
--- a/applications/gpio/scenes/gpio_scene_config.h
+++ b/applications/gpio/scenes/gpio_scene_config.h
@@ -2,3 +2,4 @@ ADD_SCENE(gpio, start, Start)
 ADD_SCENE(gpio, test, Test)
 ADD_SCENE(gpio, usb_uart, UsbUart)
 ADD_SCENE(gpio, usb_uart_cfg, UsbUartCfg)
+ADD_SCENE(gpio, usb_uart_close_rpc, UsbUartCloseRpc)
diff --git a/applications/gpio/scenes/gpio_scene_start.c b/applications/gpio/scenes/gpio_scene_start.c
index d0adb35e..39aabbd8 100644
--- a/applications/gpio/scenes/gpio_scene_start.c
+++ b/applications/gpio/scenes/gpio_scene_start.c
@@ -1,5 +1,6 @@
 #include "../gpio_app_i.h"
 #include "furi_hal_power.h"
+#include "furi_hal_usb.h"
 
 enum GpioItem {
     GpioItemUsbUart,
@@ -86,7 +87,11 @@ bool gpio_scene_start_on_event(void* context, SceneManagerEvent event) {
             scene_manager_next_scene(app->scene_manager, GpioSceneTest);
         } else if(event.event == GpioStartEventUsbUart) {
             scene_manager_set_scene_state(app->scene_manager, GpioSceneStart, GpioItemUsbUart);
-            scene_manager_next_scene(app->scene_manager, GpioSceneUsbUart);
+            if(!furi_hal_usb_is_locked()) {
+                scene_manager_next_scene(app->scene_manager, GpioSceneUsbUart);
+            } else {
+                scene_manager_next_scene(app->scene_manager, GpioSceneUsbUartCloseRpc);
+            }
         }
         consumed = true;
     }
diff --git a/applications/gpio/scenes/gpio_scene_usb_uart.c b/applications/gpio/scenes/gpio_scene_usb_uart.c
index 8bf900cd..f8f473ee 100644
--- a/applications/gpio/scenes/gpio_scene_usb_uart.c
+++ b/applications/gpio/scenes/gpio_scene_usb_uart.c
@@ -31,7 +31,7 @@ void gpio_scene_usb_uart_on_enter(void* context) {
     usb_uart_get_state(app->usb_uart_bridge, &scene_usb_uart->state);
 
     gpio_usb_uart_set_callback(app->gpio_usb_uart, gpio_scene_usb_uart_callback, app);
-    scene_manager_set_scene_state(app->scene_manager, GpioAppViewUsbUart, 0);
+    scene_manager_set_scene_state(app->scene_manager, GpioSceneUsbUart, 0);
     view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUart);
     notification_message(app->notifications, &sequence_display_lock);
 }
@@ -39,8 +39,8 @@ void gpio_scene_usb_uart_on_enter(void* context) {
 bool gpio_scene_usb_uart_on_event(void* context, SceneManagerEvent event) {
     GpioApp* app = context;
     if(event.type == SceneManagerEventTypeCustom) {
-        scene_manager_set_scene_state(app->scene_manager, GpioAppViewUsbUart, 1);
-        scene_manager_next_scene(app->scene_manager, GpioAppViewUsbUartCfg);
+        scene_manager_set_scene_state(app->scene_manager, GpioSceneUsbUart, 1);
+        scene_manager_next_scene(app->scene_manager, GpioSceneUsbUartCfg);
         return true;
     } else if(event.type == SceneManagerEventTypeTick) {
         uint32_t tx_cnt_last = scene_usb_uart->state.tx_cnt;
@@ -58,7 +58,7 @@ bool gpio_scene_usb_uart_on_event(void* context, SceneManagerEvent event) {
 
 void gpio_scene_usb_uart_on_exit(void* context) {
     GpioApp* app = context;
-    uint32_t prev_state = scene_manager_get_scene_state(app->scene_manager, GpioAppViewUsbUart);
+    uint32_t prev_state = scene_manager_get_scene_state(app->scene_manager, GpioSceneUsbUart);
     if(prev_state == 0) {
         usb_uart_disable(app->usb_uart_bridge);
         free(scene_usb_uart);
diff --git a/applications/gpio/scenes/gpio_scene_usb_uart_close_rpc.c b/applications/gpio/scenes/gpio_scene_usb_uart_close_rpc.c
new file mode 100644
index 00000000..e09f2fd3
--- /dev/null
+++ b/applications/gpio/scenes/gpio_scene_usb_uart_close_rpc.c
@@ -0,0 +1,53 @@
+#include "../gpio_app_i.h"
+#include "../gpio_custom_event.h"
+
+static void gpio_scene_usb_uart_close_rpc_event_callback(
+    GuiButtonType result,
+    InputType type,
+    void* context) {
+    furi_assert(context);
+    GpioApp* app = context;
+
+    if((result == GuiButtonTypeLeft) && (type == InputTypeShort)) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, GpioCustomEventErrorBack);
+    }
+}
+
+void gpio_scene_usb_uart_close_rpc_on_enter(void* context) {
+    GpioApp* app = context;
+
+    widget_add_string_multiline_element(
+        app->widget,
+        63,
+        10,
+        AlignCenter,
+        AlignTop,
+        FontSecondary,
+        "Disconnect from\ncompanion app\nto use this function");
+
+    widget_add_button_element(
+        app->widget, GuiButtonTypeLeft, "Back", gpio_scene_usb_uart_close_rpc_event_callback, app);
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUartCloseRpc);
+}
+
+bool gpio_scene_usb_uart_close_rpc_on_event(void* context, SceneManagerEvent event) {
+    GpioApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == GpioCustomEventErrorBack) {
+            if(!scene_manager_previous_scene(app->scene_manager)) {
+                scene_manager_stop(app->scene_manager);
+                view_dispatcher_stop(app->view_dispatcher);
+            }
+            consumed = true;
+        }
+    }
+    return consumed;
+}
+
+void gpio_scene_usb_uart_close_rpc_on_exit(void* context) {
+    GpioApp* app = context;
+    widget_reset(app->widget);
+}
diff --git a/applications/gpio/usb_uart_bridge.c b/applications/gpio/usb_uart_bridge.c
index 2832e7f8..51c2bc32 100644
--- a/applications/gpio/usb_uart_bridge.c
+++ b/applications/gpio/usb_uart_bridge.c
@@ -83,11 +83,12 @@ static void usb_uart_on_irq_cb(UartIrqEvent ev, uint8_t data, void* context) {
 }
 
 static void usb_uart_vcp_init(UsbUartBridge* usb_uart, uint8_t vcp_ch) {
+    furi_hal_usb_unlock();
     if(vcp_ch == 0) {
-        furi_hal_usb_set_config(&usb_cdc_single, NULL);
+        furi_check(furi_hal_usb_set_config(&usb_cdc_single, NULL) == true);
         furi_hal_vcp_disable();
     } else {
-        furi_hal_usb_set_config(&usb_cdc_dual, NULL);
+        furi_check(furi_hal_usb_set_config(&usb_cdc_dual, NULL) == true);
     }
     furi_hal_cdc_set_callbacks(vcp_ch, (CdcCallbacks*)&cdc_cb, usb_uart);
 }
@@ -247,6 +248,7 @@ static int32_t usb_uart_worker(void* context) {
 
     usb_uart_vcp_deinit(usb_uart, usb_uart->cfg.vcp_ch);
     usb_uart_serial_deinit(usb_uart, usb_uart->cfg.uart_ch);
+    furi_hal_usb_unlock();
     furi_hal_usb_set_config(usb_mode_prev, NULL);
     if(usb_uart->cfg.flow_pins != 0) {
         hal_gpio_init_simple(flow_pins[usb_uart->cfg.flow_pins - 1][0], GpioModeAnalog);
diff --git a/applications/gpio/usb_uart_bridge.h b/applications/gpio/usb_uart_bridge.h
index e35ec2da..b456c3cc 100644
--- a/applications/gpio/usb_uart_bridge.h
+++ b/applications/gpio/usb_uart_bridge.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <stdbool.h>
 
 typedef struct UsbUartBridge UsbUartBridge;
 
diff --git a/applications/rpc/rpc_cli.c b/applications/rpc/rpc_cli.c
index 36ae9ef3..db184529 100644
--- a/applications/rpc/rpc_cli.c
+++ b/applications/rpc/rpc_cli.c
@@ -2,10 +2,12 @@
 #include <furi.h>
 #include <rpc/rpc.h>
 #include <furi_hal.h>
+#include <semphr.h>
 
 typedef struct {
     Cli* cli;
     bool session_close_request;
+    SemaphoreHandle_t terminate_semaphore;
 } CliRpc;
 
 #define CLI_READ_BUFFER_SIZE 64
@@ -26,19 +28,30 @@ static void rpc_session_close_callback(void* context) {
     cli_rpc->session_close_request = true;
 }
 
+static void rpc_session_terminated_callback(void* context) {
+    furi_check(context);
+    CliRpc* cli_rpc = context;
+
+    xSemaphoreGive(cli_rpc->terminate_semaphore);
+}
+
 void rpc_cli_command_start_session(Cli* cli, string_t args, void* context) {
     Rpc* rpc = context;
 
+    furi_hal_usb_lock();
     RpcSession* rpc_session = rpc_session_open(rpc);
     if(rpc_session == NULL) {
         printf("Session start error\r\n");
+        furi_hal_usb_unlock();
         return;
     }
 
     CliRpc cli_rpc = {.cli = cli, .session_close_request = false};
+    cli_rpc.terminate_semaphore = xSemaphoreCreateBinary();
     rpc_session_set_context(rpc_session, &cli_rpc);
     rpc_session_set_send_bytes_callback(rpc_session, rpc_send_bytes_callback);
     rpc_session_set_close_callback(rpc_session, rpc_session_close_callback);
+    rpc_session_set_terminated_callback(rpc_session, rpc_session_terminated_callback);
 
     uint8_t* buffer = malloc(CLI_READ_BUFFER_SIZE);
     size_t size_received = 0;
@@ -57,5 +70,11 @@ void rpc_cli_command_start_session(Cli* cli, string_t args, void* context) {
     }
 
     rpc_session_close(rpc_session);
+
+    furi_check(xSemaphoreTake(cli_rpc.terminate_semaphore, portMAX_DELAY));
+
+    vSemaphoreDelete(cli_rpc.terminate_semaphore);
+
     free(buffer);
+    furi_hal_usb_unlock();
 }
diff --git a/applications/u2f/scenes/u2f_scene_error.c b/applications/u2f/scenes/u2f_scene_error.c
index 76406fbf..d4018367 100644
--- a/applications/u2f/scenes/u2f_scene_error.c
+++ b/applications/u2f/scenes/u2f_scene_error.c
@@ -12,16 +12,26 @@ static void u2f_scene_error_event_callback(GuiButtonType result, InputType type,
 void u2f_scene_error_on_enter(void* context) {
     U2fApp* app = context;
 
-    widget_add_icon_element(app->widget, 0, 0, &I_SDQuestion_35x43);
-
-    widget_add_string_multiline_element(
-        app->widget,
-        81,
-        4,
-        AlignCenter,
-        AlignTop,
-        FontSecondary,
-        "No SD card or\napp data found.\nThis app will not\nwork without\nrequired files.");
+    if(app->error == U2fAppErrorNoFiles) {
+        widget_add_icon_element(app->widget, 0, 0, &I_SDQuestion_35x43);
+        widget_add_string_multiline_element(
+            app->widget,
+            81,
+            4,
+            AlignCenter,
+            AlignTop,
+            FontSecondary,
+            "No SD card or\napp data found.\nThis app will not\nwork without\nrequired files.");
+    } else if(app->error == U2fAppErrorCloseRpc) {
+        widget_add_string_multiline_element(
+            app->widget,
+            63,
+            10,
+            AlignCenter,
+            AlignTop,
+            FontSecondary,
+            "Disconnect from\ncompanion app\nto use this function");
+    }
 
     widget_add_button_element(
         app->widget, GuiButtonTypeLeft, "Back", u2f_scene_error_event_callback, app);
diff --git a/applications/u2f/u2f_app.c b/applications/u2f/u2f_app.c
index 88d86855..8a673dbc 100644
--- a/applications/u2f/u2f_app.c
+++ b/applications/u2f/u2f_app.c
@@ -48,10 +48,16 @@ U2fApp* u2f_app_alloc() {
     view_dispatcher_add_view(
         app->view_dispatcher, U2fAppViewMain, u2f_view_get_view(app->u2f_view));
 
-    if(u2f_data_check(true)) {
-        scene_manager_next_scene(app->scene_manager, U2fSceneMain);
-    } else {
+    if(furi_hal_usb_is_locked()) {
+        app->error = U2fAppErrorCloseRpc;
         scene_manager_next_scene(app->scene_manager, U2fSceneError);
+    } else {
+        if(u2f_data_check(true)) {
+            scene_manager_next_scene(app->scene_manager, U2fSceneMain);
+        } else {
+            app->error = U2fAppErrorNoFiles;
+            scene_manager_next_scene(app->scene_manager, U2fSceneError);
+        }
     }
 
     return app;
diff --git a/applications/u2f/u2f_app_i.h b/applications/u2f/u2f_app_i.h
index 41048b31..fa9f6f09 100644
--- a/applications/u2f/u2f_app_i.h
+++ b/applications/u2f/u2f_app_i.h
@@ -15,6 +15,11 @@
 #include "u2f_hid.h"
 #include "u2f.h"
 
+typedef enum {
+    U2fAppErrorNoFiles,
+    U2fAppErrorCloseRpc,
+} U2fAppError;
+
 typedef enum {
     U2fCustomEventNone,
 
@@ -52,4 +57,5 @@ struct U2fApp {
     U2fData* u2f_instance;
     GpioCustomEvent event_cur;
     bool u2f_ready;
+    U2fAppError error;
 };
diff --git a/applications/u2f/u2f_hid.c b/applications/u2f/u2f_hid.c
index e48f8b1c..a2b291d6 100644
--- a/applications/u2f/u2f_hid.c
+++ b/applications/u2f/u2f_hid.c
@@ -191,7 +191,7 @@ static int32_t u2f_hid_worker(void* context) {
     FURI_LOG_D(WORKER_TAG, "Init");
 
     FuriHalUsbInterface* usb_mode_prev = furi_hal_usb_get_config();
-    furi_hal_usb_set_config(&usb_hid_u2f, NULL);
+    furi_check(furi_hal_usb_set_config(&usb_hid_u2f, NULL) == true);
 
     u2f_hid->lock_timer = osTimerNew(u2f_hid_lock_timeout_callback, osTimerOnce, u2f_hid, NULL);
 
diff --git a/firmware/targets/f7/furi_hal/furi_hal_usb.c b/firmware/targets/f7/furi_hal/furi_hal_usb.c
index ac87dfe2..db769e2a 100644
--- a/firmware/targets/f7/furi_hal/furi_hal_usb.c
+++ b/firmware/targets/f7/furi_hal/furi_hal_usb.c
@@ -16,6 +16,7 @@ typedef struct {
     osTimerId_t tmr;
     bool enabled;
     bool connected;
+    bool mode_lock;
     FuriHalUsbInterface* if_cur;
     FuriHalUsbInterface* if_next;
     void* if_ctx;
@@ -89,27 +90,47 @@ void furi_hal_usb_init(void) {
     FURI_LOG_I(TAG, "Init OK");
 }
 
-void furi_hal_usb_set_config(FuriHalUsbInterface* new_if, void* ctx) {
+bool furi_hal_usb_set_config(FuriHalUsbInterface* new_if, void* ctx) {
+    if(usb.mode_lock) {
+        return false;
+    }
+
     usb.if_next = new_if;
     usb.if_ctx = ctx;
     if(usb.thread == NULL) {
         // Service thread hasn't started yet, so just save interface mode
-        return;
+        return true;
     }
     furi_assert(usb.thread);
     osThreadFlagsSet(furi_thread_get_thread_id(usb.thread), EventModeChange);
+    return true;
 }
 
 FuriHalUsbInterface* furi_hal_usb_get_config() {
     return usb.if_cur;
 }
 
+void furi_hal_usb_lock() {
+    FURI_LOG_I(TAG, "Mode lock");
+    usb.mode_lock = true;
+}
+
+void furi_hal_usb_unlock() {
+    FURI_LOG_I(TAG, "Mode unlock");
+    usb.mode_lock = false;
+}
+
+bool furi_hal_usb_is_locked() {
+    return usb.mode_lock;
+}
+
 void furi_hal_usb_disable() {
     furi_assert(usb.thread);
     osThreadFlagsSet(furi_thread_get_thread_id(usb.thread), EventDisable);
 }
 
 void furi_hal_usb_enable() {
+    furi_assert(usb.thread);
     osThreadFlagsSet(furi_thread_get_thread_id(usb.thread), EventEnable);
 }
 
diff --git a/firmware/targets/furi_hal_include/furi_hal_usb.h b/firmware/targets/furi_hal_include/furi_hal_usb.h
index f1a05107..33115c11 100644
--- a/firmware/targets/furi_hal_include/furi_hal_usb.h
+++ b/firmware/targets/furi_hal_include/furi_hal_usb.h
@@ -42,8 +42,9 @@ void furi_hal_usb_init();
  *
  * @param      mode new USB device mode
  * @param      ctx context passed to device mode init function
+ * @return     true - mode switch started, false - mode switch is locked
  */
-void furi_hal_usb_set_config(FuriHalUsbInterface* new_if, void* ctx);
+bool furi_hal_usb_set_config(FuriHalUsbInterface* new_if, void* ctx);
 
 /** Get USB device configuration
  *
@@ -51,6 +52,20 @@ void furi_hal_usb_set_config(FuriHalUsbInterface* new_if, void* ctx);
  */
 FuriHalUsbInterface* furi_hal_usb_get_config();
 
+/** Lock USB device mode switch
+ */
+void furi_hal_usb_lock();
+
+/** Unlock USB device mode switch
+ */
+void furi_hal_usb_unlock();
+
+/** Check if USB device mode switch locked
+ * 
+ * @return    lock state
+ */
+bool furi_hal_usb_is_locked();
+
 /** Disable USB device
  */
 void furi_hal_usb_disable();