Hello, all. Check your pic to be an original one, if you want to downgrade/upgrade. Fw 1.39 doesn't have bootloader, so, if you want to downgrade your pic, is a little rosky. Vauxcom updates your opcom interfave when connecting to a newer car. Is well known that v1.39 os a stable version for corsa c model, so if you want do downgrade, you will have to use opcom software 2009 or 2010, with an original pic inside your interface.