Re: Downgrade from GDDR3 Preview back to Amber Failing - Nokia Lumia 920
you can downgrade,
1. use NCS offline,
2. disable auto detect device,
3. click file >open product>rm-821>enter,
4.click programing>select recovery,
5. disconnect your phone and start recovery,
6.when the retry screen pops up, plug in phone and press the vol down + power, after vibe click retry,
7. use this version of NCS 2012.51.4.4,
its possible to downgrade, even downgraded to 1232.5951.1249 just to test , I downgraded from GDR3 preview