This is a customer solution of Opcom Bootloader Repair with TL866 ICSP port
You need a working TL866 programmer first!
Free download all picture, .ept and pic18f458 v1.39 files in rar:
With this method, you can free to downgrade OPCOM firmware to 1.39 version and fix bootloader errors.
Circuit serial programming connection
Press Open and slect v1.39 pic 18f458 files
Then do as the pictures display
NOTE: YOU WILL TRY ON YOUR OWN RISK.
CREDITS to AKI1 in the MH community