My G1 shutdown when restarts - Android Software/Hacking General [Developers Only]

Hello.
I have a G1 phone, and sometimes I do some actualization in my phone but the last time i did it, the software was really very slow and left response, I removed the battery to restart, since that my phone shutdown when the "ANDROID" logo appears in the screen, I've tried to downgrade software but still doesn't work, sometimes it passes the "android" logo but after that goes down when asks to open the keyboard to sign in in google accont.
Any Help?
Thank you

I've downgraded to RC29 and the problem is still the same. Always shutdown

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