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- File extension is .LFU
- minimal file length is 0x2e bytes
- first 5 bytes must be 0x002c00004c
- 6th byte is the number of lens records
- See FF5BEC94 IsValidLensFirmware() in 5dm3, 1.1.2
- For 5D Mark III, 650D/T4i and maybe 1Dx
no real header, version or CRC/checsum ? strange...
[TT] [LL PP PP ... CC] TT = 1 byte type LL = 1 byte "payload length + 1" PP = payload CC = checksum (0xFF - PP-bytes - LL)
Type 0x00 Edit
First Frame, unknown content 0x2B bytes payload mostly 0x00. maybe sizes and flags.
Type 0x02 Edit
Looks like lens firmware content Payload format: [OO OO OO] [DD DD ... DD] OO = Offset DD = Data (0x10 bytes) CC = Checksum header/data (without
Type 0x08 Edit
Last Frame, unknown content (0x03 bytes payload all zeros)
Indy: It is close to update records of type 0x200 for TX19A MPU: See Canon_SRec_format