It's recommended that you do a hard reset before attempting this
Be aware this may void your warranty
Here's the instructions on how to flash your phone to the leaked ROM which unlocks GPS on the Verizon Omnia i910 and allows you to use any of the cooked i910 ROM's.
As of 7/16/2009 there was an offical ROM release from Verizon/Samsung. Unless you have a specific need for this ROM there is NO LONGER any reason to install it as Verizon has fulfilled their promise to unlock our GPS. Please visit the Verizon website site to obtain your copy of the update tool.Instructions have been updated to include Vista and simplification, original source was idoctor.org, but they can easily extracted from the PDF attached below.
I nor anyone else is in any way responsible for damaged hardware through this process. PLEASE DO THIS AT YOUR OWN RISK. Chances are any questions you have are already answered in this thread, try reading

.
First off you'll want to make sure you download the Samsung UMDL utility which is available at the bottom of this post. And also be sure to download the leaked ROM. I try to keep this link updated, if it's dead please don't cry about it - I'll get around to finding another link.
Before Starting- Make SURE that you have USB2.0 ports on your computer and that you flash using those. Many users have reported bricks using USB1.1 standards.
- Have at the very least a 50% charge on your battery (preferably 100%) as losing power midflash with almost guarantee a bricked phone.
- Do not attempt if your phone is overheated, let it cool first.
- Backup all of your contacts and stuff because they will be deleted.
- Most importantly FOLLOW THE DIRECTIONS!!
Step 1: Uncheck "
Allow USB Connections" in Connection Settings for ActiveSync if using Windows XP. If you're using Vista you can find this setting in Windows Mobile Device Center -> Mobile Device Settings -> Connection Settings.
Step 2: On you phone go to Start -> Settings -> Connections -> USB Connection Mode -> Change from "
ActiveSync" to "
Mass Storage" -> Click OK. Now power and unplug your Omnia for now.
Step 3: Start Samsung Omnia UMDL on your PC
Step 4: Click "
Unified Image File (*.img)" and browse to where you saved the ROM file. (i910WM6.1.REV10.CC20.VZW.img)
Step 5: Click "
DETECT"
Step 6: Attach your i910 to the USB Cable (Make sure it's off!)
Step 7: Now that it's plugged in, power it on.
Step 8: Your i910 should now be detected. You can verify this just by watching the "
Downloading Log".
Step 9: After the flash is complete (In UMDL Device 1 will read "Job Done. Launched!) your i910 will automatically restart it's self and boot into WinMo Setup.
Step 10: To active the GPS Go to Start -> Settings -> Personal -> Phone -> "Services" tab -> GPS -> Change Setting from "911 Only" to "Location On" -> OK. Wait 20 seconds, and soft reset.
Some of the new features included in this ROM
*GPS Unlocked!
*Overall performance increase.
*5% battery increments! (In Easy Settings only)
*Smart Memo
*Dice
*Favorite Settings, now known as Easy Settings
*New widgets. Easier to move around, can remove from list. Weatherbug, WL search added.
*Windows Live
*Text Message Retry
*Dialer Touch Lock Settings-Off, 2s, 5s, 10s.
*Disable Threaded Text Messaging via System Settings
*Sharper fonts.
*iPhone-esque popup keyboard keys.
*Better kinetic scrolling in Samsung apps.
*Samsung Volume Control
If you're having problems with
Google Maps still after this update try this
Go to -> Menu -> select Use GPS
Go to -> Menu -> Options -> Gps Settings... -> choose Set Manually -> select COM8 -> select 57600 -> OK
You should now be able to use Google Maps with GPS enabled!! Give it a few minutes outside to establish a sat link.
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How to get "External GPS" to show up in settings in new rom:
Perform this registry change
HKLM-> Control Panel-> GPS Settings-> delete "Redirect"-> soft reset
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After you've successfully flashed to the leaked ROM you can start using the custom cooked ROM's. If you're feeling frisky and would like to try some custom ROM's check out Adrynalyne's new kitchen forum here