If permanent Display safe message, then this can only happen when radio and display have different codes, which should not happen when radio is safe. this does not sound correct.
When you reset CD30mp3 and BID, you should get display safe, radio safe message. When you swap BID to GID you should only get radio safe message.
Check mid speed canbus on display is correct
Activate theft protection with code from eeprom
de-activate theft protection with code from eeprom
Activate theft protection with code from car pass
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