diff --git a/esp3d/configuration.h b/esp3d/configuration.h
index cd923502..ac763979 100644
--- a/esp3d/configuration.h
+++ b/esp3d/configuration.h
@@ -99,13 +99,13 @@
 //ESP_SPIFFS_FILESYSTEM       0
 //ESP_FAT_FILESYSTEM          1
 //ESP_LITTLEFS_FILESYSTEM     2 //Not Yet implemented
-#define FILESYSTEM_FEATURE ESP_SPIFFS_FILESYSTEM
+#define FILESYSTEM_FEATURE ESP_FAT_FILESYSTEM
 
 //DIRECT_PIN_FEATURE: allow to access pin using ESP201 command
 #define DIRECT_PIN_FEATURE
 
 //TIMESTAMP_FEATURE: set time system
-#define TIMESTAMP_FEATURE
+//#define TIMESTAMP_FEATURE
 
 //FILESYSTEM_TIMESTAMP_FEATURE: allow to get last write time from FILESYSTEM files
 //#define FILESYSTEM_TIMESTAMP_FEATURE
diff --git a/esp3d/src/include/version.h b/esp3d/src/include/version.h
index 59ef5f3e..3d1773c0 100644
--- a/esp3d/src/include/version.h
+++ b/esp3d/src/include/version.h
@@ -22,7 +22,7 @@
 #define _VERSION_ESP3D_H
 
 //version and sources location
-#define FW_VERSION "3.0.0.a10"
+#define FW_VERSION "3.0.0.a11"
 #define REPOSITORY "https://github.com/luc-github/ESP3D"
 
 #endif //_VERSION_ESP3D_H
diff --git a/esp3d/src/modules/filesystem/esp_filesystem.cpp b/esp3d/src/modules/filesystem/esp_filesystem.cpp
index cebf4c14..0841863d 100644
--- a/esp3d/src/modules/filesystem/esp_filesystem.cpp
+++ b/esp3d/src/modules/filesystem/esp_filesystem.cpp
@@ -144,7 +144,10 @@ size_t ESP_FileSystem::max_update_size()
 #if defined (ARDUINO_ARCH_ESP32)
     //Is OTA available ?
     if (esp_ota_get_running_partition()) {
-        flashsize = ESP.getFreeSketchSpace() + ESP.getSketchSize();
+        const esp_partition_t* partition = esp_ota_get_next_update_partition(NULL);
+        if (partition){
+            flashsize = partition->size;
+        }
     }  else {
         flashsize = 0;
     }