[Mogul, XV6800 ROM Development] RyanMogul:
Here, I got a beater mogul to do the same thing last night. Here is how I got it out of the jam. This is my last step by step I can do. Do not skip anything. Do the steps in exact how it tells you to with confidence. Please at this time have the phone UNPLUGGED from the PC (Personal Computer)

You need to do this and when you are done you can flash any GPS ONLY ROM to the phone, wether its custom or not.

Now how to start depends on if you are still stuck in bootloader or if you can get the phone to boot into the Windows Mobile Operating System.

If

you are successfully able to boot into Windows Mobile using the Non GPS ROM that you said you flashed read and follow instructions (a) and (b) and then follow instructions (#2)

If

you are stuck in bootloader Follow instructions (a) and (b) and then follow instructions (#1) first and (#2) second.

(a) Make sure you install a fresh copy of Active Sync 4.5 and that you have installed the HTC Windows drivers AFTER active sync. Reboot the PC in between uninstalling Active sync and re-installing that and the HTC drivers.

(b) Unplug every USB device from your computer and have NO programs running in the backround. Plug your USB to Mini USB (data cable) into the PC in a Main USB Port built onto the Motherboard.

(#1) When its booted back up give the PC a while to smooth out then right click the Active sync icon on your PC's taskbar. Pick connection settings and then look for the Box with Allow USB connections. Clear the box (disable) the usb connections. Then click OK. Unplug every USB device from your computer and have NO programs running in the backround. Plug your USB to Mini USB (data cable) into the PC in a Main USB Port built onto the Motherboard. Now turn the phone on and it should go right to bootloader (if its stuck like you say) Wait a second and then plug the phone into the PC and wait a few moments. Now run the ExitBL.exe that I had you extract. It should issue its commands and then it will hard reset the ROM you have on there and boot up. Unplug the phone before it boots all the way up into Windows Mobile. Hopefully it should still be the NON gps ROM like you said since the flash stops at 11%.. Let it Auto Customize and everything while the phone is UNPLUGGED. When it boots back up time to move on.

(#2) Now we can first right click the Active sync icon on your PC's taskbar. Pick connection settings and then look for the Box with Allow USB connections. Check the box (enable) the usb connections. Then click OK. Now you can plug the (Already booted to Windows Mobile) phone into the PC and give it a couple moments and make sure its synced. The icon in taskbar should be green. Also you should be able to access the device and storage card memory so please check that you are able to do so.. That will ensure we are connected properly. When ready you can run the Olipro240.exe (not the extracted contents, the actual exe) and follow its instructions until it comes up saying you must unplug and plug the phone back in. PLEASE dont miss that, DO NOT hit a key to continue UNTIL you have UNPLUGGED the phone waited a moment, then plugged it back in. Then you can hit a key and continue but PAUSE again and minimize that window. Now right click the Active sync icon on your PC's taskbar. Pick connection settings and then look for the Box with Allow USB connections. Clear the box (disable) the usb connections. Then click OK. Now open the window back up and click to continue. That will exit the Bootloader and reset the phone. Now right away UNPLUG the phone and Manually place it in Bootloader Manually. Now PLUG the phone back into the PC. You can now flash the Stock Sprint ROM.exe from my HTC unlock directory. Let it complete and dont panic, it will complete. When it does UNPLUG in shortly after first bootscreen and let it boot. Let it customize and everything. When its done you now have a GPS radio and unlocked bootloader. You can then flash any GPS ROM stock or custom. If this tutorial doesnt get you out, I do not know what will.