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I need to send in my Garminfone to T-Mobile. I've rooted it and installed the 2.1 upgrade. The master reset doesn't restore it to 1.6. I know Super One Click will unroot it. Does anyone know how to revert back to 1.6? Thanks.

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From what you're asking it sounds unlikely, but did you do any kind of system backup before/after rooting, and definitely before loading a custom ROM? I think you're going to have problems finding a download of the original ROM anywhere as Garmin are extremely protective of their map app and data which will be embedded in any original ROM. –  GAThrawn Nov 30 '10 at 0:05

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not sure about the root process for Garminfone, but if you have access to your bootloader (usually termal like with a list of options) just put a 1.6 stock rom on your sd card and flash it.

I tried googleing "stock 1.6 garminfone rom" with no success, probably because of what GAThrawn said, but someone over at xda-developers might have something if want to go check out there forums.

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This is supposed to be an update for 1.6, but I'm not sure how you'd load it. http://www.garminasus.com/en_US/support/software/006-B1130-00.update

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