diff --git a/applications/bt/bt_service/bt.c b/applications/bt/bt_service/bt.c
index 720f4854..8ce7f9ce 100755
--- a/applications/bt/bt_service/bt.c
+++ b/applications/bt/bt_service/bt.c
@@ -320,7 +320,7 @@ int32_t bt_srv() {
     Bt* bt = bt_alloc();
 
     // Read keys
-    if(!bt_load_key_storage(bt)) {
+    if(!bt_keys_storage_load(bt)) {
         FURI_LOG_W(TAG, "Failed to load bonding keys");
     }
 
@@ -365,11 +365,11 @@ int32_t bt_srv() {
             // Display PIN code
             bt_pin_code_show(bt, message.data.pin_code);
         } else if(message.type == BtMessageTypeKeysStorageUpdated) {
-            bt_save_key_storage(bt);
+            bt_keys_storage_save(bt);
         } else if(message.type == BtMessageTypeSetProfile) {
             bt_change_profile(bt, &message);
         } else if(message.type == BtMessageTypeForgetBondedDevices) {
-            bt_delete_key_storage(bt);
+            bt_keys_storage_delete(bt);
         }
     }
     return 0;
diff --git a/applications/bt/bt_service/bt_keys_storage.c b/applications/bt/bt_service/bt_keys_storage.c
index 74df1020..e4f426c8 100644
--- a/applications/bt/bt_service/bt_keys_storage.c
+++ b/applications/bt/bt_service/bt_keys_storage.c
@@ -1,46 +1,47 @@
 #include "bt_keys_storage.h"
+
 #include <furi.h>
-#include <file_worker.h>
+#include <lib/toolbox/saved_struct.h>
 
-#define BT_KEYS_STORAGE_TAG "bt keys storage"
 #define BT_KEYS_STORAGE_PATH "/int/bt.keys"
+#define BT_KEYS_STORAGE_VERSION (0)
+#define BT_KEYS_STORAGE_MAGIC (0x18)
 
-bool bt_load_key_storage(Bt* bt) {
+bool bt_keys_storage_load(Bt* bt) {
     furi_assert(bt);
-
     bool file_loaded = false;
-    furi_hal_bt_get_key_storage_buff(&bt->bt_keys_addr_start, &bt->bt_keys_size);
 
-    FileWorker* file_worker = file_worker_alloc(true);
-    if(file_worker_open(file_worker, BT_KEYS_STORAGE_PATH, FSAM_READ, FSOM_OPEN_EXISTING)) {
-        furi_hal_bt_nvm_sram_sem_acquire();
-        if(file_worker_read(file_worker, bt->bt_keys_addr_start, bt->bt_keys_size)) {
-            file_loaded = true;
-        }
-        furi_hal_bt_nvm_sram_sem_release();
-    }
-    file_worker_free(file_worker);
+    furi_hal_bt_get_key_storage_buff(&bt->bt_keys_addr_start, &bt->bt_keys_size);
+    furi_hal_bt_nvm_sram_sem_acquire();
+    file_loaded = saved_struct_load(
+        BT_KEYS_STORAGE_PATH,
+        bt->bt_keys_addr_start,
+        bt->bt_keys_size,
+        BT_KEYS_STORAGE_MAGIC,
+        BT_KEYS_STORAGE_VERSION);
+    furi_hal_bt_nvm_sram_sem_release();
+
     return file_loaded;
 }
 
-bool bt_save_key_storage(Bt* bt) {
+bool bt_keys_storage_save(Bt* bt) {
     furi_assert(bt);
     furi_assert(bt->bt_keys_addr_start);
-
     bool file_saved = false;
-    FileWorker* file_worker = file_worker_alloc(true);
-    if(file_worker_open(file_worker, BT_KEYS_STORAGE_PATH, FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
-        furi_hal_bt_nvm_sram_sem_acquire();
-        if(file_worker_write(file_worker, bt->bt_keys_addr_start, bt->bt_keys_size)) {
-            file_saved = true;
-        }
-        furi_hal_bt_nvm_sram_sem_release();
-    }
-    file_worker_free(file_worker);
+
+    furi_hal_bt_nvm_sram_sem_acquire();
+    file_saved = saved_struct_save(
+        BT_KEYS_STORAGE_PATH,
+        bt->bt_keys_addr_start,
+        bt->bt_keys_size,
+        BT_KEYS_STORAGE_MAGIC,
+        BT_KEYS_STORAGE_VERSION);
+    furi_hal_bt_nvm_sram_sem_release();
+
     return file_saved;
 }
 
-bool bt_delete_key_storage(Bt* bt) {
+bool bt_keys_storage_delete(Bt* bt) {
     furi_assert(bt);
     bool delete_succeed = false;
     bool bt_is_active = furi_hal_bt_is_active();
diff --git a/applications/bt/bt_service/bt_keys_storage.h b/applications/bt/bt_service/bt_keys_storage.h
index e763e6a7..68d4476a 100644
--- a/applications/bt/bt_service/bt_keys_storage.h
+++ b/applications/bt/bt_service/bt_keys_storage.h
@@ -2,8 +2,8 @@
 
 #include "bt_i.h"
 
-bool bt_load_key_storage(Bt* bt);
+bool bt_keys_storage_load(Bt* bt);
 
-bool bt_save_key_storage(Bt* bt);
+bool bt_keys_storage_save(Bt* bt);
 
-bool bt_delete_key_storage(Bt* bt);
+bool bt_keys_storage_delete(Bt* bt);
diff --git a/applications/bt/bt_settings.c b/applications/bt/bt_settings.c
index 7b52321c..dbb2fd05 100644
--- a/applications/bt/bt_settings.c
+++ b/applications/bt/bt_settings.c
@@ -1,50 +1,22 @@
 #include "bt_settings.h"
-#include <furi.h>
-#include <file_worker.h>
 
-#define TAG "BtSettings"
+#include <furi.h>
+#include <lib/toolbox/saved_struct.h>
+
 #define BT_SETTINGS_PATH "/int/bt.settings"
+#define BT_SETTINGS_VERSION (0)
+#define BT_SETTINGS_MAGIC (0x19)
 
 bool bt_settings_load(BtSettings* bt_settings) {
     furi_assert(bt_settings);
-    bool file_loaded = false;
-    BtSettings settings = {};
 
-    FURI_LOG_I(TAG, "Loading settings from \"%s\"", BT_SETTINGS_PATH);
-    FileWorker* file_worker = file_worker_alloc(true);
-    if(file_worker_open(file_worker, BT_SETTINGS_PATH, FSAM_READ, FSOM_OPEN_EXISTING)) {
-        if(file_worker_read(file_worker, &settings, sizeof(settings))) {
-            file_loaded = true;
-        }
-    }
-    file_worker_free(file_worker);
-
-    if(file_loaded) {
-        FURI_LOG_I(TAG, "Settings load success");
-        if(settings.version != BT_SETTINGS_VERSION) {
-            FURI_LOG_E(TAG, "Settings version mismatch");
-        } else {
-            osKernelLock();
-            *bt_settings = settings;
-            osKernelUnlock();
-        }
-    } else {
-        FURI_LOG_E(TAG, "Settings load failed");
-    }
-    return file_loaded;
+    return saved_struct_load(
+        BT_SETTINGS_PATH, bt_settings, sizeof(BtSettings), BT_SETTINGS_MAGIC, BT_SETTINGS_VERSION);
 }
 
 bool bt_settings_save(BtSettings* bt_settings) {
     furi_assert(bt_settings);
-    bool result = false;
 
-    FileWorker* file_worker = file_worker_alloc(true);
-    if(file_worker_open(file_worker, BT_SETTINGS_PATH, FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
-        if(file_worker_write(file_worker, bt_settings, sizeof(BtSettings))) {
-            FURI_LOG_I(TAG, "Settings saved to \"%s\"", BT_SETTINGS_PATH);
-            result = true;
-        }
-    }
-    file_worker_free(file_worker);
-    return result;
+    return saved_struct_save(
+        BT_SETTINGS_PATH, bt_settings, sizeof(BtSettings), BT_SETTINGS_MAGIC, BT_SETTINGS_VERSION);
 }
diff --git a/applications/bt/bt_settings.h b/applications/bt/bt_settings.h
index d0a539ea..1a98668a 100644
--- a/applications/bt/bt_settings.h
+++ b/applications/bt/bt_settings.h
@@ -3,10 +3,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-#define BT_SETTINGS_VERSION (0)
-
 typedef struct {
-    uint8_t version;
     bool enabled;
 } BtSettings;
 
diff --git a/applications/infrared/infrared_app.cpp b/applications/infrared/infrared_app.cpp
index 35d814dc..64bdb2b2 100644
--- a/applications/infrared/infrared_app.cpp
+++ b/applications/infrared/infrared_app.cpp
@@ -49,12 +49,14 @@ int32_t InfraredApp::run(void* args) {
 InfraredApp::InfraredApp() {
     furi_check(InfraredAppRemoteManager::max_button_name_length < get_text_store_size());
     notification = static_cast<NotificationApp*>(furi_record_open("notification"));
+    dialogs = static_cast<DialogsApp*>(furi_record_open("dialogs"));
     infrared_worker = infrared_worker_alloc();
 }
 
 InfraredApp::~InfraredApp() {
     infrared_worker_free(infrared_worker);
     furi_record_close("notification");
+    furi_record_close("dialogs");
     for(auto& [key, scene] : scenes) delete scene;
 }
 
@@ -248,6 +250,10 @@ void InfraredApp::notify_blink_green() {
     notification_message(notification, &sequence);
 }
 
+DialogsApp* InfraredApp::get_dialogs() {
+    return dialogs;
+}
+
 void InfraredApp::notify_green_on() {
     notification_message(notification, &sequence_set_only_green_255);
 }
diff --git a/applications/infrared/infrared_app.h b/applications/infrared/infrared_app.h
index 39897272..f1580402 100644
--- a/applications/infrared/infrared_app.h
+++ b/applications/infrared/infrared_app.h
@@ -9,6 +9,7 @@
 #include <forward_list>
 #include <stdint.h>
 #include <notification/notification_messages.h>
+#include <dialogs/dialogs.h>
 #include <infrared_worker.h>
 
 #include "scene/infrared_app_scene.h"
@@ -228,6 +229,9 @@ public:
     /** Blink green light */
     void notify_blink_green();
 
+    /** Get Dialogs instance */
+    DialogsApp* get_dialogs();
+
     /** Text input callback
  *
  * @param context - context to pass to callback
@@ -286,6 +290,8 @@ private:
 
     /** Notification instance */
     NotificationApp* notification;
+    /** Dialogs instance */
+    DialogsApp* dialogs;
     /** View manager instance */
     InfraredAppViewManager view_manager;
     /** Remote manager instance */
diff --git a/applications/infrared/infrared_app_brute_force.cpp b/applications/infrared/infrared_app_brute_force.cpp
index 24be4d3e..2910a399 100644
--- a/applications/infrared/infrared_app_brute_force.cpp
+++ b/applications/infrared/infrared_app_brute_force.cpp
@@ -5,7 +5,6 @@
 #include <memory>
 #include <m-string.h>
 #include <furi.h>
-#include <file_worker_cpp.h>
 
 void InfraredAppBruteForce::add_record(int index, const char* name) {
     records[name].index = index;
diff --git a/applications/infrared/infrared_app_remote_manager.cpp b/applications/infrared/infrared_app_remote_manager.cpp
index 9fbef84f..4fd64553 100644
--- a/applications/infrared/infrared_app_remote_manager.cpp
+++ b/applications/infrared/infrared_app_remote_manager.cpp
@@ -1,4 +1,3 @@
-#include <file_worker_cpp.h>
 #include <flipper_format/flipper_format.h>
 #include "infrared_app_remote_manager.h"
 #include "infrared/helpers/infrared_parser.h"
@@ -22,26 +21,34 @@ std::string InfraredAppRemoteManager::make_full_name(
 }
 
 std::string InfraredAppRemoteManager::find_vacant_remote_name(const std::string& name) {
-    bool exist = true;
-    FileWorkerCpp file_worker;
+    std::string result_name;
+    Storage* storage = static_cast<Storage*>(furi_record_open("storage"));
 
-    if(!file_worker.is_file_exist(
-           make_full_name(InfraredApp::infrared_directory, name).c_str(), &exist)) {
-        return std::string();
-    } else if(!exist) {
-        return name;
+    FS_Error error = storage_common_stat(
+        storage, make_full_name(InfraredApp::infrared_directory, name).c_str(), NULL);
+
+    if(error == FSE_NOT_EXIST) {
+        result_name = name;
+    } else if(error != FSE_OK) {
+        result_name = std::string();
+    } else {
+        /* if suggested name is occupied, try another one (name2, name3, etc) */
+        uint32_t i = 1;
+        std::string new_name;
+        do {
+            new_name = make_full_name(InfraredApp::infrared_directory, name + std::to_string(++i));
+            error = storage_common_stat(storage, new_name.c_str(), NULL);
+        } while(error == FSE_OK);
+
+        if(error == FSE_NOT_EXIST) {
+            result_name = name + std::to_string(i);
+        } else {
+            result_name = std::string();
+        }
     }
 
-    /* if suggested name is occupied, try another one (name2, name3, etc) */
-    uint32_t i = 1;
-    bool file_worker_result = false;
-    std::string new_name;
-    do {
-        new_name = make_full_name(InfraredApp::infrared_directory, name + std::to_string(++i));
-        file_worker_result = file_worker.is_file_exist(new_name.c_str(), &exist);
-    } while(file_worker_result && exist);
-
-    return !exist ? name + std::to_string(i) : std::string();
+    furi_record_close("storage");
+    return result_name;
 }
 
 bool InfraredAppRemoteManager::add_button(const char* button_name, const InfraredAppSignal& signal) {
@@ -84,12 +91,14 @@ const InfraredAppSignal& InfraredAppRemoteManager::get_button_data(size_t index)
 }
 
 bool InfraredAppRemoteManager::delete_remote() {
-    bool result;
-    FileWorkerCpp file_worker;
-    result = file_worker.remove(make_full_name(remote->path, remote->name).c_str());
+    Storage* storage = static_cast<Storage*>(furi_record_open("storage"));
 
+    FS_Error error =
+        storage_common_remove(storage, make_full_name(remote->path, remote->name).c_str());
     reset_remote();
-    return result;
+
+    furi_record_close("storage");
+    return (error == FSE_OK || error == FSE_NOT_EXIST);
 }
 
 void InfraredAppRemoteManager::reset_remote() {
@@ -129,14 +138,15 @@ bool InfraredAppRemoteManager::rename_remote(const char* str) {
         return false;
     }
 
-    FileWorkerCpp file_worker;
+    Storage* storage = static_cast<Storage*>(furi_record_open("storage"));
+
     std::string old_filename = make_full_name(remote->path, remote->name);
     std::string new_filename = make_full_name(remote->path, new_name);
-    bool result = file_worker.rename(old_filename.c_str(), new_filename.c_str());
-
+    FS_Error error = storage_common_rename(storage, old_filename.c_str(), new_filename.c_str());
     remote->name = new_name;
 
-    return result;
+    furi_record_close("storage");
+    return (error == FSE_OK || error == FSE_EXIST);
 }
 
 bool InfraredAppRemoteManager::rename_button(uint32_t index, const char* str) {
@@ -155,11 +165,10 @@ size_t InfraredAppRemoteManager::get_number_of_buttons() {
 
 bool InfraredAppRemoteManager::store(void) {
     bool result = false;
-    FileWorkerCpp file_worker;
-
-    if(!file_worker.mkdir(InfraredApp::infrared_directory)) return false;
-
     Storage* storage = static_cast<Storage*>(furi_record_open("storage"));
+
+    if(!storage_simply_mkdir(storage, InfraredApp::infrared_directory)) return false;
+
     FlipperFormat* ff = flipper_format_file_alloc(storage);
 
     FURI_LOG_I(
diff --git a/applications/infrared/scene/infrared_app_scene_learn_success.cpp b/applications/infrared/scene/infrared_app_scene_learn_success.cpp
index 61d60ab5..b620a5ed 100644
--- a/applications/infrared/scene/infrared_app_scene_learn_success.cpp
+++ b/applications/infrared/scene/infrared_app_scene_learn_success.cpp
@@ -1,5 +1,4 @@
 #include <gui/modules/dialog_ex.h>
-#include <file_worker_cpp.h>
 #include <memory>
 #include <dolphin/dolphin.h>
 
@@ -88,13 +87,8 @@ bool InfraredAppSceneLearnSuccess::on_event(InfraredApp* app, InfraredAppEvent*
             break;
         case DialogExResultRight: {
             consumed = true;
-            FileWorkerCpp file_worker;
             if(!button_pressed) {
-                if(file_worker.check_errors()) {
-                    app->switch_to_next_scene(InfraredApp::Scene::LearnEnterName);
-                } else {
-                    app->switch_to_previous_scene();
-                }
+                app->switch_to_next_scene(InfraredApp::Scene::LearnEnterName);
             }
             break;
         }
diff --git a/applications/infrared/scene/infrared_app_scene_remote_list.cpp b/applications/infrared/scene/infrared_app_scene_remote_list.cpp
index defebf76..95ef2e41 100644
--- a/applications/infrared/scene/infrared_app_scene_remote_list.cpp
+++ b/applications/infrared/scene/infrared_app_scene_remote_list.cpp
@@ -1,12 +1,10 @@
 #include "../infrared_app.h"
 #include "infrared/infrared_app_event.h"
 #include <text_store.h>
-#include <file_worker_cpp.h>
 
 void InfraredAppSceneRemoteList::on_enter(InfraredApp* app) {
     furi_assert(app);
 
-    FileWorkerCpp file_worker;
     bool result = false;
     bool file_select_result;
     auto remote_manager = app->get_remote_manager();
@@ -15,13 +13,15 @@ void InfraredAppSceneRemoteList::on_enter(InfraredApp* app) {
         last_selected_remote.size() ? last_selected_remote.c_str() : nullptr;
     auto filename_ts =
         std::make_unique<TextStore>(InfraredAppRemoteManager::max_remote_name_length);
+    DialogsApp* dialogs = app->get_dialogs();
 
     InfraredAppViewManager* view_manager = app->get_view_manager();
     ButtonMenu* button_menu = view_manager->get_button_menu();
     button_menu_reset(button_menu);
     view_manager->switch_to(InfraredAppViewManager::ViewId::ButtonMenu);
 
-    file_select_result = file_worker.file_select(
+    file_select_result = dialog_file_select_show(
+        dialogs,
         InfraredApp::infrared_directory,
         InfraredApp::infrared_extension,
         filename_ts->text,
diff --git a/applications/loader/loader.c b/applications/loader/loader.c
index 738479cf..3882647e 100644
--- a/applications/loader/loader.c
+++ b/applications/loader/loader.c
@@ -239,26 +239,11 @@ static void loader_thread_state_callback(FuriThreadState thread_state, void* con
         event.type = LoaderEventTypeApplicationStarted;
         furi_pubsub_publish(loader_instance->pubsub, &event);
         furi_hal_power_insomnia_enter();
-
-        // Snapshot current memory usage
-        instance->free_heap_size = memmgr_get_free_heap();
     } else if(thread_state == FuriThreadStateStopped) {
-        /*
-         * Current Leak Sanitizer assumes that memory is allocated and freed
-         * inside one thread. Timers are allocated in one task, but freed in
-         * Timer-Task thread, and xTimerDelete() just put command to queue.
-         * To avoid some bad cases there are few fixes:
-         * 1) delay for Timer to process commands
-         * 2) there are 'heap diff' which shows difference in heap before task
-         * started and after task completed. In process of leakage monitoring
-         * both values should be taken into account.
-         */
-        furi_hal_delay_ms(20);
-        int heap_diff = instance->free_heap_size - memmgr_get_free_heap();
         FURI_LOG_I(
             TAG,
-            "Application thread stopped. Heap allocation balance: %d. Thread allocation balance: %d.",
-            heap_diff,
+            "Application thread stopped. Free heap: %d. Thread allocation balance: %d.",
+            memmgr_get_free_heap(),
             furi_thread_get_heap_size(instance->application_thread));
 
         if(loader_instance->application_arguments) {
diff --git a/applications/loader/loader_i.h b/applications/loader/loader_i.h
index a8b8bfc0..4c937b94 100644
--- a/applications/loader/loader_i.h
+++ b/applications/loader/loader_i.h
@@ -30,7 +30,6 @@ struct Loader {
     Submenu* debug_menu;
     Submenu* settings_menu;
 
-    size_t free_heap_size;
     volatile uint8_t lock_count;
 
     FuriPubSub* pubsub;
diff --git a/core/furi/memmgr_heap.c b/core/furi/memmgr_heap.c
index 9455371e..8544092e 100644
--- a/core/furi/memmgr_heap.c
+++ b/core/furi/memmgr_heap.c
@@ -171,7 +171,16 @@ size_t memmgr_heap_get_thread_memory(osThreadId_t thread_id) {
                 !MemmgrHeapAllocDict_end_p(alloc_dict_it);
                 MemmgrHeapAllocDict_next(alloc_dict_it)) {
                 MemmgrHeapAllocDict_itref_t* data = MemmgrHeapAllocDict_ref(alloc_dict_it);
-                leftovers += data->value;
+                if(data->key != 0) {
+                    uint8_t* puc = (uint8_t*)data->key;
+                    puc -= xHeapStructSize;
+                    BlockLink_t* pxLink = (void*)puc;
+
+                    if((pxLink->xBlockSize & xBlockAllocatedBit) != 0 &&
+                       pxLink->pxNextFreeBlock == NULL) {
+                        leftovers += data->value;
+                    }
+                }
             }
         }
         memmgr_heap_thread_trace_depth--;
diff --git a/core/furi/thread.c b/core/furi/thread.c
index ee86f62e..a2898c1a 100644
--- a/core/furi/thread.c
+++ b/core/furi/thread.c
@@ -45,6 +45,7 @@ static void furi_thread_body(void* context) {
     thread->ret = thread->callback(thread->context);
 
     if(thread->heap_trace_enabled == true) {
+        osDelay(33);
         thread->heap_size = memmgr_heap_get_thread_memory(thread_id);
         memmgr_heap_disable_thread_trace(thread_id);
     }
diff --git a/firmware/targets/f7/furi_hal/furi_hal_nfc.c b/firmware/targets/f7/furi_hal/furi_hal_nfc.c
index ae776b53..bf9ea18c 100755
--- a/firmware/targets/f7/furi_hal/furi_hal_nfc.c
+++ b/firmware/targets/f7/furi_hal/furi_hal_nfc.c
@@ -230,7 +230,7 @@ bool furi_hal_nfc_listen(
             rfalNfcDeactivate(true);
             return false;
         }
-        osThreadYield();
+        osDelay(1);
     }
     return true;
 }
@@ -498,7 +498,7 @@ bool furi_hal_nfc_tx_rx(FuriHalNfcTxRxContext* tx_rx, uint16_t timeout_ms) {
         } else {
             start = DWT->CYCCNT;
         }
-        osThreadYield();
+        osDelay(1);
     }
 
     if(tx_rx->tx_rx_type == FuriHalNfcTxRxTypeRaw) {