| Appendix C BOOT-51 Error Messages
Error Message | Meaning
--- | ---
checksum error | Intel-HEX record checksum is not correct.
illegal command | A command other than U or G has been entered.
illegal hex digit | Hex digit expected. Another character received.
illegal record ID | Intel-HEX record type is greater than 1.
unexpected character | The received Intel-HEX record doesn't start with ':', or doesn't end with CR, LF, or CR/LF.