Xhorse Multi Prog read and write Cheverlet Cobalt ACDelco E83 ECM on bench successfully.
Quick search E83 and select GM Delco E83B (Cheverlet Cobalt)
Check wiring diagram
Connect E83 ECM with Multi prog.
Read INT flash.
Multi-prog will also do checksum correction on this ECM.
It also read 16-digit code which will be required when you do it in boot mode.