[G1 Q&A, Help & Troubleshooting] idbl_fanatic:
Yup, I had the same issue, downgrade to RC29, then follow this:

**Originally Posted by dizzydevil111**

please make sure you have rc29 or lower by typer (enter)reboot(enter)

if the phone reboots then you have rc 29 or lower.

if not, follow this guide to downgrade to rc29

2. Mount your SD card in Windows and reformat it as FAT32. The HTC

bootloader won't be able to see the RC29 (or RC7) image otherwise. Make

sure you back up all your files first!

3. Download the appropriate image (RC29 for USA or RC7 for UK) from

http://koushikdutta.blurryfox.com/G1/DREAIMG-RC29.zip or

http://koushikdutta.blurryfox.com/G1/DREAIMG-RC7.zip . This is a DOWNGRADE

to the Android version that contains a root shell bug (this exploit just

seems too easy). I got these files from the forum thread

http://xdaforums.com/showthread.php?t=442480 .

4. Extract the DREAIMG.nbh file from the downloaded zip archive and copy it

to your SD card (again, for me, this had to be formatted as FAT32, not just

regular FAT which is the default). Don't put it in a folder, just stick it

directly on there.

5. Disconnect the SD card the right way (eject, unmount, or otherwise tell

your OS you are unplugging it) to make sure the data gets written. If you

used an SD card reader, put the SD card back in your phone.

6. Make sure your phone has a full battery, then turn it off. Turn it back

on by holding down the CAMERA and POWER buttons. This should get you into

the HTC bootloader (the funky red, green, and blue screen).

7. If everything was done correctly, the bootloader will detect the image.

You'll be taken to a different screen that asks you to press the POWER

button to install the image. Do this, but beware, you will lose all your

saved data on your phone (with the exception of things that are synced with

Google's servers, like contacts, calendar, Gmail, etc.).

8. Wait for the update to complete. The progress bar will fill up, then

all the steps will say OK beside them, and finally, it will ask you to press

the "action key" (I think this means click the trackball). DO NOT do

anything until you see this message. The progress bar needs to DISAPPEAR,

not just fill up.

9. You now have the stock RC29 installed. Take out the battery, put it

back in, and turn on your phone. It should ask you to activate your Google

account again -

once you have this done type on the phone again (enter)setprop persist.service.adb.enable 1(enter)

your pc should now pick this up as an android adb device

point it to the correct drivers found in the file called androidusbwindows

once that installs, extract the adb file anywhere on your pc. (best place is root directory)

open up a dos command prompt and type (cd ..<enter>)

then type (cd ..<enter>)

then type adbshell

should look like this thereafter

$

referring to the dollar sign

then copy the following line into your dos command prompt and press enter

(am start -a android.intent.action.MAIN -n com.android.settings/.Settings)

please make sure that you copy the contents of adbwin.zip in your ROOT FOLDER or else you will be going through hell

voila you should be able to access wifi

pm me if it worked for you