diff --git a/.vscode/settings.json b/.vscode/settings.json
index 4f9e9321..892612c0 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -38,6 +38,9 @@
         "mlib_common.h": "c",
         "ios": "c",
         "limits": "c",
-        "algorithm": "c"
+        "algorithm": "c",
+        "app_status.h": "c",
+        "app_cmd.h": "c",
+        "rfid_main.h": "c"
     }
 }
\ No newline at end of file
diff --git a/fw/application/Makefile b/fw/application/Makefile
index 611e42d7..71e4e42a 100644
--- a/fw/application/Makefile
+++ b/fw/application/Makefile
@@ -491,7 +491,10 @@ endif
 # cmd
 ifeq ($(BOARD),NEO)
 SRC_FILES += \
-  $(CHAMELEON_ROOT)/application/src/app_cmd.c 
+  $(CHAMELEON_ROOT)/application/src/app_cmd.c \
+  $(CHAMELEON_ROOT)/application/src/rfid_main.c \
+  $(CHAMELEON_ROOT)/application/src/utils/dataframe.c \
+  $(CHAMELEON_ROOT)/application/src/bsp/bsp_wdt.c
 endif 
 
 # Include folders common to all targets
@@ -701,7 +704,9 @@ INC_FOLDERS += \
   $(CHAMELEON_ROOT)/application/src/rfid \
   $(CHAMELEON_ROOT)/application/src/rfid/nfctag \
   $(CHAMELEON_ROOT)/application/src/rfid/nfctag/hf \
+  $(CHAMELEON_ROOT)/application/src/rfid/nfctag/lf \
   $(CHAMELEON_ROOT)/application/src/rfid/reader/hf \
+  $(CHAMELEON_ROOT)/application/src/rfid/reader/lf \
   $(CHAMELEON_ROOT)/application/src/utils \
   $(CHAMELEON_ROOT)/application/src \
   $(CHAMELEON_ROOT)/application/src/bsp \
diff --git a/fw/application/src/app/chameleon/port/fds_utils.c b/fw/application/src/app/chameleon/port/fds_utils.c
index cf4ff100..ccad30a0 100644
--- a/fw/application/src/app/chameleon/port/fds_utils.c
+++ b/fw/application/src/app/chameleon/port/fds_utils.c
@@ -22,7 +22,7 @@ static void fds_map_file_name(uint16_t id, uint16_t key, char *path) {
     }
 }
 
-bool fds_read_sync(uint16_t id, uint16_t key, uint16_t* max_length, uint8_t *buffer) {
+bool fds_read_sync(uint16_t id, uint16_t key, uint16_t *max_length, uint8_t *buffer) {
     char path[VFS_MAX_PATH_LEN];
     fds_map_file_name(id, key, path);
     int32_t bytes_read = vfs_get_default_driver()->read_file_data(path, buffer, *max_length);
@@ -71,3 +71,13 @@ int32_t fds_write_meta(uint16_t id, uint16_t key, vfs_meta_t *meta) {
     vfs_meta_encode(meta_buf, sizeof(meta_buf), meta);
     return vfs_get_default_driver()->update_file_meta(path, meta_buf, sizeof(meta_buf));
 }
+
+int fds_delete_sync(uint16_t id, uint16_t key) {
+    // FIXME
+    return 0;
+}
+
+bool fds_wipe(void) {
+    // FIXME
+    return true;
+}
\ No newline at end of file
diff --git a/fw/application/src/app/chameleon/port/fds_utils.h b/fw/application/src/app/chameleon/port/fds_utils.h
index 8ddb1746..1729bd89 100644
--- a/fw/application/src/app/chameleon/port/fds_utils.h
+++ b/fw/application/src/app/chameleon/port/fds_utils.h
@@ -8,4 +8,10 @@
 bool fds_config_file_exists();
 int32_t fds_read_meta(uint16_t id, uint16_t key, vfs_meta_t *meta);
 int32_t fds_write_meta(uint16_t id, uint16_t key, vfs_meta_t *meta);
-#endif 
\ No newline at end of file
+
+int fds_delete_sync(uint16_t id, uint16_t key);
+bool fds_is_exists(uint16_t id, uint16_t key);
+void fds_util_init(void);
+void fds_gc_sync(void);
+bool fds_wipe(void);
+#endif
\ No newline at end of file
diff --git a/fw/application/src/main.c b/fw/application/src/main.c
index f6015c05..a8de7381 100644
--- a/fw/application/src/main.c
+++ b/fw/application/src/main.c
@@ -101,6 +101,8 @@
 #include "nfc_reader.h"
 #include "tusb.h"
 
+#include "dataframe.h"
+
 // #include "usbd.h"
 
 #define APP_SCHED_MAX_EVENT_SIZE 255 /**< Maximum size of scheduler events. */
@@ -322,6 +324,9 @@ int main(void) {
         // usb_tick();
 
         tud_task(); // device task
+
+        // Data pack process
+        data_frame_process();
 #endif
         NRF_LOG_FLUSH();
         if (NRF_LOG_PROCESS() == false) {
diff --git a/fw/application/src/mod/tusb/family.c b/fw/application/src/mod/tusb/family.c
index 6b700ddc..b885355b 100644
--- a/fw/application/src/mod/tusb/family.c
+++ b/fw/application/src/mod/tusb/family.c
@@ -37,6 +37,11 @@
 #include "nrfx.h"
 #include "nrfx_power.h"
 
+#include "tusb.h"
+
+#include "app_cmd.h"
+#include "dataframe.h"
+
 //--------------------------------------------------------------------+
 // Forward USB interrupt events to TinyUSB IRQ Handler
 //--------------------------------------------------------------------+
@@ -58,6 +63,11 @@ enum { USB_EVT_DETECTED = 0, USB_EVT_REMOVED = 1, USB_EVT_READY = 2 };
 //--------------------------------------------------------------------+
 
 void board_init(void) {
+
+    // init dataframe
+    //  cmd callback register
+    on_data_frame_complete(on_data_frame_received);
+
     // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
     // 2 is highest for application
     NVIC_SetPriority(USBD_IRQn, 2);
@@ -115,3 +125,18 @@ void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info) {
     (void)pc;
     (void)info;
 }
+
+void tud_cdc_rx_cb(uint8_t itf) {
+    // Take out the first byte first, WHY ???
+    NRF_LOG_INFO("cdc rx: %d", tud_cdc_available());
+    static uint8_t cdc_data_buffer[1];
+    uint32_t ret = 0;
+    tud_cdc_read(cdc_data_buffer, 1);
+    do {
+        ret = tud_cdc_read(cdc_data_buffer, 1);
+        if (ret > 0) {
+            // The byte after success
+            data_frame_receive(cdc_data_buffer, 1);
+        }
+    } while (ret > 0);
+}
\ No newline at end of file
diff --git a/fw/components/chameleon-ultra b/fw/components/chameleon-ultra
index b6b2460c..ed55f548 160000
--- a/fw/components/chameleon-ultra
+++ b/fw/components/chameleon-ultra
@@ -1 +1 @@
-Subproject commit b6b2460cab911bda189ce0565ddf56b24f288bef
+Subproject commit ed55f54868c1b293cb9eecb6c594d9a97bf4e19f