diff --git a/esp32/include/ap_service.h b/esp32/include/ap_service.h
index b669d77..f5a3dae 100644
--- a/esp32/include/ap_service.h
+++ b/esp32/include/ap_service.h
@@ -2,7 +2,7 @@
 
 #include <template/stateful_service.h>
 #include <template/stateful_proto_endpoint.h>
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 #include <settings/ap_settings.h>
 #include <utils/timing.h>
 #include <wifi/wifi_idf.h>
diff --git a/esp32/include/mdns_service.h b/esp32/include/mdns_service.h
index 81cb940..396fa64 100644
--- a/esp32/include/mdns_service.h
+++ b/esp32/include/mdns_service.h
@@ -4,7 +4,7 @@
 #include <mdns.h>
 #include <template/stateful_service.h>
 #include <template/stateful_proto_endpoint.h>
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 #include <settings/mdns_settings.h>
 #include <utils/timing.h>
 
diff --git a/esp32/include/peripherals/camera_service.h b/esp32/include/peripherals/camera_service.h
index eb9fa4c..a9d97f2 100644
--- a/esp32/include/peripherals/camera_service.h
+++ b/esp32/include/peripherals/camera_service.h
@@ -5,7 +5,7 @@
 #include <features.h>
 #include <template/stateful_service.h>
 #include <template/stateful_proto_endpoint.h>
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 
 #include <settings/camera_settings.h>
 
diff --git a/esp32/include/peripherals/peripherals.h b/esp32/include/peripherals/peripherals.h
index 2fd2acf..de76f7a 100644
--- a/esp32/include/peripherals/peripherals.h
+++ b/esp32/include/peripherals/peripherals.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 #include <template/stateful_service.h>
 #include <template/stateful_proto_endpoint.h>
 #include <utils/math_utils.h>
diff --git a/esp32/include/peripherals/servo_controller.h b/esp32/include/peripherals/servo_controller.h
index 72c919a..23bb25f 100644
--- a/esp32/include/peripherals/servo_controller.h
+++ b/esp32/include/peripherals/servo_controller.h
@@ -2,7 +2,7 @@
 #define ServoController_h
 
 #include <peripherals/drivers/pca9685.h>
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 #include <template/stateful_proto_endpoint.h>
 #include <template/stateful_service.h>
 #include <utils/math_utils.h>
@@ -24,22 +24,17 @@ inline ServoSettings ServoSettings_defaults() {
     ServoSettings settings = {};
     settings.servos_count = 12;
     const api_Servo defaults[12] = {
-        {306, -1, 0, 2.0f, "Servo1"},   {306, 1, -45, 2.0f, "Servo2"},
-        {306, 1, 90, 2.0f, "Servo3"}, {306, -1, 0, 2.0f, "Servo4"},
-        {306, -1, 45, 2.0f, "Servo5"}, {306, -1, -90, 2.0f, "Servo6"},
-        {306, 1, 0, 2.0f, "Servo7"},   {306, 1, -45, 2.0f, "Servo8"},
-        {306, 1, 90, 2.0f, "Servo9"}, {306, 1, 0, 2.0f, "Servo10"},
-        {306, -1, 45, 2.0f, "Servo11"}, {306, -1, -90, 2.0f, "Servo12"}
-    };
+        {306, -1, 0, 2.0f, "Servo1"}, {306, 1, -45, 2.0f, "Servo2"},  {306, 1, 90, 2.0f, "Servo3"},
+        {306, -1, 0, 2.0f, "Servo4"}, {306, -1, 45, 2.0f, "Servo5"},  {306, -1, -90, 2.0f, "Servo6"},
+        {306, 1, 0, 2.0f, "Servo7"},  {306, 1, -45, 2.0f, "Servo8"},  {306, 1, 90, 2.0f, "Servo9"},
+        {306, 1, 0, 2.0f, "Servo10"}, {306, -1, 45, 2.0f, "Servo11"}, {306, -1, -90, 2.0f, "Servo12"}};
     for (int i = 0; i < 12; i++) {
         settings.servos[i] = defaults[i];
     }
     return settings;
 }
 
-inline void ServoSettings_read(const ServoSettings &settings, ServoSettings &proto) {
-    proto = settings;
-}
+inline void ServoSettings_read(const ServoSettings &settings, ServoSettings &proto) { proto = settings; }
 
 inline StateUpdateResult ServoSettings_update(const ServoSettings &proto, ServoSettings &settings) {
     settings = proto;
@@ -52,9 +47,8 @@ class ServoController : public StatefulService<ServoSettings> {
         : protoEndpoint(ServoSettings_read, ServoSettings_update, this,
                         API_REQUEST_EXTRACTOR(servo_settings, ServoSettings),
                         API_RESPONSE_ASSIGNER(servo_settings, ServoSettings)),
-          _persistence(ServoSettings_read, ServoSettings_update, this,
-                       SERVO_SETTINGS_FILE, api_ServoSettings_fields, api_ServoSettings_size,
-                       ServoSettings_defaults()) {}
+          _persistence(ServoSettings_read, ServoSettings_update, this, SERVO_SETTINGS_FILE, api_ServoSettings_fields,
+                       api_ServoSettings_size, ServoSettings_defaults()) {}
 
     void begin() {
         _persistence.readFromFS();
diff --git a/esp32/include/template/stateful_persistence.h b/esp32/include/template/stateful_persistence.h
index cd86c9c..7b22b7e 100644
--- a/esp32/include/template/stateful_persistence.h
+++ b/esp32/include/template/stateful_persistence.h
@@ -1,35 +1,65 @@
-#ifndef FSPersistence_h
-#define FSPersistence_h
+#pragma once
 
 #include <template/stateful_service.h>
+#include <template/state_result.h>
 #include <filesystem.h>
-#include <ArduinoJson.h>
+#include <pb_encode.h>
+#include <pb_decode.h>
 #include <cstdio>
 #include <sys/stat.h>
+#include <esp_log.h>
+
+static const char *TAG_PERSISTENCE = "FSPersistencePB";
 
 template <class T>
-class FSPersistence {
+class FSPersistencePB {
   public:
-    FSPersistence(JsonStateReader<T> stateReader, JsonStateUpdater<T> stateUpdater, StatefulService<T> *statefulService,
-                  const char *filePath)
+    using ProtoStateReader = std::function<void(const T &, T &)>;
+    using ProtoStateUpdater = std::function<StateUpdateResult(const T &, T &)>;
+
+    FSPersistencePB(ProtoStateReader stateReader, ProtoStateUpdater stateUpdater, StatefulService<T> *statefulService,
+                    const char *filePath, const pb_msgdesc_t *msgDescriptor, size_t maxSize, const T &defaultState)
         : _stateReader(stateReader),
           _stateUpdater(stateUpdater),
           _statefulService(statefulService),
           _filePath(filePath),
+          _msgDescriptor(msgDescriptor),
+          _maxSize(maxSize),
+          _defaultState(defaultState),
           _updateHandlerId(0) {
         enableUpdateHandler();
     }
 
     void readFromFS() {
-        std::string content = FileSystem::readFile(_filePath);
+        FILE *file = fopen(_filePath, "rb");
 
-        if (!content.empty()) {
-            JsonDocument jsonDocument;
-            DeserializationError error = deserializeJson(jsonDocument, content);
-            if (error == DeserializationError::Ok) {
-                JsonVariant jsonObject = jsonDocument.as<JsonVariant>();
-                _statefulService->updateWithoutPropagation(jsonObject, _stateUpdater);
-                return;
+        if (file) {
+            fseek(file, 0, SEEK_END);
+            size_t fileSize = ftell(file);
+            fseek(file, 0, SEEK_SET);
+
+            if (fileSize > 0 && fileSize <= _maxSize) {
+                uint8_t *buffer = new uint8_t[fileSize];
+                size_t bytesRead = fread(buffer, 1, fileSize, file);
+                fclose(file);
+
+                if (bytesRead == fileSize) {
+                    T *protoMsg = new T();
+                    *protoMsg = {};
+                    pb_istream_t stream = pb_istream_from_buffer(buffer, bytesRead);
+
+                    if (pb_decode(&stream, _msgDescriptor, protoMsg)) {
+                        _statefulService->updateWithoutPropagation(
+                            [this, protoMsg](T &state) { return _stateUpdater(*protoMsg, state); });
+                        delete protoMsg;
+                        delete[] buffer;
+                        return;
+                    }
+                    delete protoMsg;
+                }
+                delete[] buffer;
+            } else {
+                fclose(file);
             }
         }
 
@@ -38,16 +68,35 @@ class FSPersistence {
     }
 
     bool writeToFS() {
-        JsonDocument jsonDocument;
-        JsonVariant jsonObject = jsonDocument.to<JsonVariant>();
-        _statefulService->read(jsonObject, _stateReader);
+        uint8_t *buffer = new uint8_t[_maxSize];
+        pb_ostream_t stream = pb_ostream_from_buffer(buffer, _maxSize);
+
+        T *protoMsg = new T();
+        *protoMsg = {};
+        _statefulService->read([this, protoMsg](const T &state) { _stateReader(state, *protoMsg); });
+
+        bool encodeSuccess = pb_encode(&stream, _msgDescriptor, protoMsg);
+        delete protoMsg;
+
+        if (!encodeSuccess) {
+            delete[] buffer;
+            return false;
+        }
 
         mkdirs();
 
-        std::string content;
-        serializeJson(jsonDocument, content);
+        FILE *file = fopen(_filePath, "wb");
+        if (!file) {
+            ESP_LOGE(TAG_PERSISTENCE, "Failed to open file for writing: %s", _filePath);
+            delete[] buffer;
+            return false;
+        }
 
-        return FileSystem::writeFile(_filePath, content.c_str());
+        size_t written = fwrite(buffer, 1, stream.bytes_written, file);
+        fclose(file);
+        delete[] buffer;
+
+        return written == stream.bytes_written;
     }
 
     void disableUpdateHandler() {
@@ -64,11 +113,13 @@ class FSPersistence {
     }
 
   private:
-    JsonStateReader<T> _stateReader;
-    JsonStateUpdater<T> _stateUpdater;
+    ProtoStateReader _stateReader;
+    ProtoStateUpdater _stateUpdater;
     StatefulService<T> *_statefulService;
     const char *_filePath;
-    size_t _bufferSize;
+    const pb_msgdesc_t *_msgDescriptor;
+    size_t _maxSize;
+    T _defaultState;
     HandlerId _updateHandlerId;
 
     void mkdirs() {
@@ -84,11 +135,7 @@ class FSPersistence {
     }
 
   protected:
-    virtual void applyDefaults() {
-        JsonDocument jsonDocument;
-        JsonVariant jsonObject = jsonDocument.as<JsonVariant>();
-        _statefulService->updateWithoutPropagation(jsonObject, _stateUpdater);
+    void applyDefaults() {
+        _statefulService->updateWithoutPropagation([this](T &state) { return _stateUpdater(_defaultState, state); });
     }
 };
-
-#endif
diff --git a/esp32/include/template/stateful_persistence_pb.h b/esp32/include/template/stateful_persistence_pb.h
deleted file mode 100644
index 7b22b7e..0000000
--- a/esp32/include/template/stateful_persistence_pb.h
+++ /dev/null
@@ -1,141 +0,0 @@
-#pragma once
-
-#include <template/stateful_service.h>
-#include <template/state_result.h>
-#include <filesystem.h>
-#include <pb_encode.h>
-#include <pb_decode.h>
-#include <cstdio>
-#include <sys/stat.h>
-#include <esp_log.h>
-
-static const char *TAG_PERSISTENCE = "FSPersistencePB";
-
-template <class T>
-class FSPersistencePB {
-  public:
-    using ProtoStateReader = std::function<void(const T &, T &)>;
-    using ProtoStateUpdater = std::function<StateUpdateResult(const T &, T &)>;
-
-    FSPersistencePB(ProtoStateReader stateReader, ProtoStateUpdater stateUpdater, StatefulService<T> *statefulService,
-                    const char *filePath, const pb_msgdesc_t *msgDescriptor, size_t maxSize, const T &defaultState)
-        : _stateReader(stateReader),
-          _stateUpdater(stateUpdater),
-          _statefulService(statefulService),
-          _filePath(filePath),
-          _msgDescriptor(msgDescriptor),
-          _maxSize(maxSize),
-          _defaultState(defaultState),
-          _updateHandlerId(0) {
-        enableUpdateHandler();
-    }
-
-    void readFromFS() {
-        FILE *file = fopen(_filePath, "rb");
-
-        if (file) {
-            fseek(file, 0, SEEK_END);
-            size_t fileSize = ftell(file);
-            fseek(file, 0, SEEK_SET);
-
-            if (fileSize > 0 && fileSize <= _maxSize) {
-                uint8_t *buffer = new uint8_t[fileSize];
-                size_t bytesRead = fread(buffer, 1, fileSize, file);
-                fclose(file);
-
-                if (bytesRead == fileSize) {
-                    T *protoMsg = new T();
-                    *protoMsg = {};
-                    pb_istream_t stream = pb_istream_from_buffer(buffer, bytesRead);
-
-                    if (pb_decode(&stream, _msgDescriptor, protoMsg)) {
-                        _statefulService->updateWithoutPropagation(
-                            [this, protoMsg](T &state) { return _stateUpdater(*protoMsg, state); });
-                        delete protoMsg;
-                        delete[] buffer;
-                        return;
-                    }
-                    delete protoMsg;
-                }
-                delete[] buffer;
-            } else {
-                fclose(file);
-            }
-        }
-
-        applyDefaults();
-        writeToFS();
-    }
-
-    bool writeToFS() {
-        uint8_t *buffer = new uint8_t[_maxSize];
-        pb_ostream_t stream = pb_ostream_from_buffer(buffer, _maxSize);
-
-        T *protoMsg = new T();
-        *protoMsg = {};
-        _statefulService->read([this, protoMsg](const T &state) { _stateReader(state, *protoMsg); });
-
-        bool encodeSuccess = pb_encode(&stream, _msgDescriptor, protoMsg);
-        delete protoMsg;
-
-        if (!encodeSuccess) {
-            delete[] buffer;
-            return false;
-        }
-
-        mkdirs();
-
-        FILE *file = fopen(_filePath, "wb");
-        if (!file) {
-            ESP_LOGE(TAG_PERSISTENCE, "Failed to open file for writing: %s", _filePath);
-            delete[] buffer;
-            return false;
-        }
-
-        size_t written = fwrite(buffer, 1, stream.bytes_written, file);
-        fclose(file);
-        delete[] buffer;
-
-        return written == stream.bytes_written;
-    }
-
-    void disableUpdateHandler() {
-        if (_updateHandlerId) {
-            _statefulService->removeUpdateHandler(_updateHandlerId);
-            _updateHandlerId = 0;
-        }
-    }
-
-    void enableUpdateHandler() {
-        if (!_updateHandlerId) {
-            _updateHandlerId = _statefulService->addUpdateHandler([&](const std::string &originId) { writeToFS(); });
-        }
-    }
-
-  private:
-    ProtoStateReader _stateReader;
-    ProtoStateUpdater _stateUpdater;
-    StatefulService<T> *_statefulService;
-    const char *_filePath;
-    const pb_msgdesc_t *_msgDescriptor;
-    size_t _maxSize;
-    T _defaultState;
-    HandlerId _updateHandlerId;
-
-    void mkdirs() {
-        std::string path(_filePath);
-        size_t index = 0;
-        while ((index = path.find('/', index + 1)) != std::string::npos) {
-            std::string segment = path.substr(0, index);
-            struct stat st;
-            if (stat(segment.c_str(), &st) != 0) {
-                FileSystem::mkdirRecursive(segment.c_str());
-            }
-        }
-    }
-
-  protected:
-    void applyDefaults() {
-        _statefulService->updateWithoutPropagation([this](T &state) { return _stateUpdater(_defaultState, state); });
-    }
-};
diff --git a/esp32/include/wifi_service.h b/esp32/include/wifi_service.h
index 3f96da3..5857a2c 100644
--- a/esp32/include/wifi_service.h
+++ b/esp32/include/wifi_service.h
@@ -8,7 +8,7 @@
 #include <filesystem.h>
 #include <utils/timing.h>
 #include <template/stateful_service.h>
-#include <template/stateful_persistence_pb.h>
+#include <template/stateful_persistence.h>
 #include <template/stateful_proto_endpoint.h>
 #include <settings/wifi_settings.h>