import binascii import struct with open('new_firmware.pac', 'rb') as f: data = bytearray(f.read()) crc = binascii.crc32(data[:-4]) & 0xFFFFFFFF data[-4:] = struct.pack('<I', crc)
Recalculate the checksum (often located in the last 4-16 bytes). Use a Python script like: how to convert bin file to pac file hot
Append your BIN file directly after the header. import binascii import struct with open('new_firmware
Obtain a working PAC file for your device (even an older version). import binascii import struct with open('new_firmware.pac'