Updating unlocked g1
I found this tutorial on how authenticate via wifi, but keep in mind, this device is a couple years old now and I don't know if the files needed are still available.
Let me just start off by saying that this is NOT the update G1 owners have been patiently waiting for.
The reason you can't get an ADB connection is almost certainly because the "USB Debugging" settings has been switched off during the upgrade, you'd need to get into the settings and turn that back on again.
You can follow this guide to bypass the activation screen.
You will be exploiting this flaw to enable ADB access and bring up the Settings menu, from which you can enable Wi Fi and activate the device. The ADP1 device is SIM unlocked, you said you have the Developer version of the G1.
You do not need to have a T-Mobile SIM, an AT&T SIM will work.
Instead, it’s a minor update exactly like the one the original my Touch 3G received earlier this month.
The Android 1.6 update (DMD64) OTA is rolling out starting today, February 26th, and will gradually make it to the masses by March 15th.
After you install the update, the handset will reboot and you’re done! If you have any question about doing this, don’t even try it.