I assume your phone is rooted. Here is what I can provide so far and hopefully help fix your situation
In order for this to work you have to have recovery working. I'm sure your phone has died by now or you have at least done a battery pull. If so try these steps
1. Make sure G2 is off and plugged in Via USB on your computer
2. Push and
hold the
VOLUME DOWN BUTTON while also pushing down and
holding the
POWER BUTTON. After a few seconds it should boot into bootloader
IF STEP NUMBER 1 DOES NO SUCCEED THEN THE NEXT STEPS WILL NOT APPLY AND SORRY THAT I HAVE NO OTHER KNOWLEDGE TO FIX
3. Using the
volume rocker, select
recovery and push the power button to accept
4. You should now be in recovery
5. Using the
volume rocker or track pad, navigate to Wipe Data/Factory Reset, push track pad to select, track pad to accept "
yes I want to want" (or something along those lines
)
6. After data has been wiped navigate to Wipe Cache and do same as above
7. Navigate to storage and mounts, scroll down to
mount storage and select
8. Your SD should
now appear on your computer and freely view your SD card as normal.
9. Check to see if the Rom zip that you used is still on your SD card, if not. Drop on the
root of your SD card. The root of your SD card is basically the location which when your SD first opens up on your computer that shows all the folders.
Just drop it Anywhere
10. Back to the G2,
unmount storage
11. Press back until you are back to the
main Recovery page
12. Navigate to
advanced and
Wipe Dalvik Cache
13. Back to
Main Recovery Page
14. Select
Install Zip
15. Select
install zip from sd card
16. Select the
Rom Zip, then
Yes I want To Install
17. Back to
Main recovery Page
18.
Reboot System
19. Smile and say,
"YAAAAAAAAAAAAAAAAAAAAAY"