If you’re doing a FEM and you get a message that the ecu needs to be updated,
Select fem/BDC unlock.
Press advanced.
Press update.
Press next.
You will get a message , Press yes to continue.
It will generate a restore point.
It will now prepare for flashing .
It will flash bootloader and continue.
This can take some time.
Once completed, Press exit.
Go back to the unlocking step.
