I recently purchased a G1 off eBay which appeared to be running stock 1.5 firmware and build number CRB43. I found some fairly easy instructions to follow to update to 1.6, but once I rebooted in recovery mode ready to process my update.zip file, I was greeted with the following screen: I wasn't sure why it was displaying CyanogenMod since it appeared to be running standard Android 1.5, so I sent a quick email to the guy I bought the phone from. Apparently he had rooted the phone before selling it to me. I guess my question is, where can I go from here? Can I safely update to 1.6 like I was attempting to do? Can I go to 2.x or should I try a CyanogenMod build? Any help or advice will be greatly appreciated...thanks!