Hi,
From the FAQ the error is:
Error 1 - EPROM Failure
Cursory checksum of software failed.
FLASH probably needs replacing.
However if this is the result of flashing the unit, it might be a bad flash.
Previously my "DTS fix" flash went unexpected and I had trouble.
Link. However maybe just stubornly reflashing did the trick back then.
I assume you tried to reflash again?
Greetings
Benzol