diff --git a/tools/send_fw.py b/tools/send_fw.py
index bffd6e8..ecb1366 100644
--- a/tools/send_fw.py
+++ b/tools/send_fw.py
@@ -2,11 +2,12 @@ import serial
 import struct
 import time
 import sys
+import os
 from google.protobuf.message import DecodeError
 from serial.tools import list_ports
 from crccheck.crc import Crc
 
-from firmware_pb2 import FirmwareStart, FirmwarePackage, FirmwarePackageAck, FirmwareDone, UsbPackageType
+from firmware_pb2 import FirmwareStart, FirmwareFileCheck , FirmwarePackage, FirmwarePackageAck, FirmwareDone, UsbPackageType
 
 
 Crc32 = Crc(32,0x04C11DB7,0xffffffff) 
@@ -39,7 +40,7 @@ def send_package(typeid : UsbPackageType, data: bytearray, serial: serial.Serial
     serial.write(package)
 
 
-def receive_ack(serial):
+def read_header(serial):
     # Read the header
     header_data = serial.read(5)  # header size is 5 bytes
     length, typeid, check = struct.unpack('<HHB', header_data)
@@ -48,6 +49,13 @@ def receive_ack(serial):
     check_calculated = (length & 0xFF) + ((length >> 8) & 0xFF) + (typeid & 0xFF) + ((typeid >> 8) & 0xFF)
     if check != check_calculated:
         print('Header check byte mismatch')
+        return None, None
+
+    return length, typeid
+
+def receive_ack(serial):
+    length, typeid = read_header(serial)
+    if not length or typeid != UsbPackageType.FIRMWAREPACKAGEACK:
         return None
 
     # Read the message
@@ -56,9 +64,6 @@ def receive_ack(serial):
         print('Incomplete message')
         return None
 
-    if typeid != UsbPackageType.FIRMWAREPACKAGEACK:
-        return None
-
     # Parse the message
     ack = FirmwarePackageAck()
     try:
@@ -69,6 +74,27 @@ def receive_ack(serial):
 
     return ack
 
+def receive_file_check(serial):
+    length, typeid = read_header(serial)
+    if not length or typeid != UsbPackageType.FIRMWAREFILECHECK:
+        return None
+
+    # Read the message
+    message_data = serial.read(length)
+    if len(message_data) != length:
+        print('Incomplete message')
+        return None
+
+    # Parse the message
+    file_check = FirmwareFileCheck()
+    try:
+        file_check.ParseFromString(message_data)
+    except DecodeError:
+        print('Failed to parse FirmwareFileCheck')
+        return None
+
+    return file_check
+
 FILENAME = 'firmware.bin'
 ID = 0
 if len(sys.argv) > 1:
@@ -96,7 +122,7 @@ if __name__ == "__main__":
 
     # Create a FirmwareStart message
     start = FirmwareStart()
-    start.name = FILENAME
+    start.name = os.path.basename(FILENAME)
     start.size = size
     start.packages = len(packages)
     start.device_id = ID
@@ -106,27 +132,42 @@ if __name__ == "__main__":
     print(start)
     send_package(UsbPackageType.FIRMWARESTART, start.SerializeToString(), ser)
     #time.sleep(1)  # wait for the device to process the message
-
-    # Send the firmware packages
-    for (i,pack_data) in enumerate(packages):
-        package = FirmwarePackage()
-        package.counter = i
-        package.crc_pac = Crc32.calc(pack_data)
-        package.device_id = start.device_id
-        package.data = pack_data
-
-        # Send the FirmwarePackage message
-        print(package)
-        print(hex(package.crc_pac))
-        send_package(UsbPackageType.FIRMWAREPACKAGE, package.SerializeToString(), ser)
+    
+    # Receive the FirmwareFileCheck message
+    file_check = receive_file_check(ser)
+    print(file_check)
+    if not file_check:
+        print('Failed to receive FirmwareFileCheck')
+        exit(-1)
 
 
-        # Wait for the FirmwarePackageAck message
-        ack = receive_ack(ser)
-        print(ack)
-        if not ack.ack:
-            print(f'Package {i} not acknowledged')
-            exit(-1)
+    if file_check.crc_fw == start.crc_fw and file_check.size == start.size and not file_check.ready_for_data:
+        # Skip to FirmwareDone if the CRC and size match and ready_for_data is false
+        print('No need for data transfer')
+    elif file_check.ready_for_data:
+        # Send the firmware packages
+        for (i,pack_data) in enumerate(packages):
+            package = FirmwarePackage()
+            package.counter = i
+            package.crc_pac = Crc32.calc(pack_data)
+            package.device_id = start.device_id
+            package.data = pack_data
+
+            # Send the FirmwarePackage message
+            print(package)
+            print(hex(package.crc_pac))
+            send_package(UsbPackageType.FIRMWAREPACKAGE, package.SerializeToString(), ser)
+
+
+            # Wait for the FirmwarePackageAck message
+            ack = receive_ack(ser)
+            print(ack)
+            if not ack.ack:
+                print(f'Package {i} not acknowledged')
+                exit(-1)
+    else:
+        print('Error in FirmwareFileCheck message')
+        exit(-1)
 
 
     # Send the FirmwareDone message
diff --git a/tools/update_devices.py b/tools/update_devices.py
new file mode 100644
index 0000000..5ecdf93
--- /dev/null
+++ b/tools/update_devices.py
@@ -0,0 +1,11 @@
+import subprocess
+import sys
+
+def send_fw(firmware, ids):
+    for id in ids:
+        subprocess.call(['python', 'send_fw.py', firmware, str(id)])
+
+if __name__ == "__main__":
+    firmware = sys.argv[1]
+    ids = sys.argv[2].split(';')  # Split the ID string into a list
+    send_fw(firmware, ids)
\ No newline at end of file