Those who got unlock code but stuck on Google activation screen here is the solution,i did one piece of Google G1 yesterday.no need to update and downgrade and T-mobile sim for entering APN setting menu,the procedure i have done as follow try and post results.
1- put your G1 into recovery mode,for recovery mode hold down home+camera+power.
2-When u will enter recovery mode here again press and hold above 3 buttons,now u will find 3 options.(1-reboot system 2-sdcard update zip 3-wipe data and factory reset)
3- select option 3 and click with trackball.
4-now select option 1 and reboot ur system.
after rebooting ur G1 ask for insert sim card insert sim card and follow the screen.
Note: This procedure for unlocked G1 but stuck on google activation screen.
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