DK5Q firmware upload format

gistfile1.txt

FW upload starts with a packet of type 8:

byte 0 : 00
byte 1 : 08 = FW upload start command
byte 2 : 03 = packet sequence number
byte 3 : 01 = upload protocol version?  Must be 1
byte 4-5 : 00 00 = total number of bytes (16-bit little endian), 0 means 64K (max size)
byte 6-7 : 7e 04 = total number of data blocks (16-bit little endian)
byte 8-9 : 00 00 = ? (not used)
byte 10: 39 = bytes of flash data per data block (decimal: 57) (not used)
byte 11: d1 77 = ? (fw checksum?) (not used)
byte 62-63: checksum

Then follows the indicated number of data blocks as packets of type 9:
byte 0 : 00
byte 1 : 09 = FW upload data command
byte 2 : 93 = packet sequence number
byte 3-4 : 8c 03 = block number (16-bit little endian), first block is #0
byte 5-61 : flash data payload (57 bytes)
byte 62-63: checksum

Each packet of 57 bytes is flashed at address 0x08000000 + block_num*57