I was having Gw620 with v10k firmware (android 1.5). Here am trying to explain the steps did to upgrade it to openetna firmware (Android 2.2). Please refer http://code.google.com/p/openetna/wiki/Installation for reference. Don't forget to watch the videos there in that guide. I will be explaining mainly the areas where i got stuck, and the steps i did to resolve it.
- Download the openetnaV6.3-rc7.zip from http://code.google.com/p/openetna/downloads/list
- Download android sdk
- Download gapps zip
For details on how to downgrade please refer http://www.yzmall.net/GT/view/id-25316.
The update was stuck at 4% , and it always crashed saying communication failure. Here i tried to switch my usb port and changed the compatabilty of the KP500-Utils-EN.exe file to win xp sp2. I was runnig on Win 7.
Then it worked and i successfully downgraded the firmware. (plz note i wasted a lot of time before this by trying to flash )
8, Finally downgraded to v10G which have flash mode.
fastboot flash system system.img
15. Wait until the commands finished