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Originally Posted by spam2000
I think you can downgrade by disconnecting the battery for a few minutes. You do not lose your phonebook, only your radio presets.
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I believe the firmware is read off the DVD each time a DVD is removed and replaced regardless of level so if you had a 6.1 DVD, removed it and inserted a 5.1 DVD the 5.1 firmware would replace(downgrade) the 6.1 firmware.