hi

Most of the tuners changes the seed value to prevent the flash being readed by obd,
this also prevents other security access since all are seed based.

For edc16 you can use the bdm to read the hole flash+cpu+eep.

Boot can be repaired to undone this mess, allowing the ecu to work as designed keeping the tuned.
Also immo can be disabled on eeprom as someone told.

If you reflash original file you will lose the tune, also, could be possible that you need to write original file by bdm, since obd is blocked.

Best regards
H.W