I cannot enable my phone's radio?

I'm not sure how I did this, but my phone will no longer receive a phone signal. When it boots, the phone is automatically off. If I try to make a call, it asks if I want to turn on the phone. I turn it on, but then it shows no service. I have tried different radios and roms all with same result.
It is a Verizon XV6800. I think it is probably my radio. It currently has radio 3.35.04. I have tried to update it to both 3.37.78 and 3.42.50, but the phone will always reset shortly after it starts to install the new radio. I have tried both from PC or SD and neither works.

Edit:
I was able to update the radio now. The radio updates to 3.37.78, but it won't go to 3.42.50. The phone still won't work....

[drewcam888]

reinstall the stock rom and bootloader then see what happens

Installed the Relocker bootloader (2.07) after flashing to Stock(MR2). I am able to get the phone to get to the update phase in the RUU, but then it times out at 0% when I am trying to flash the 3.42.50 radio.
I haven't messed with this phone for several months, and I am starting to recall that I may have screwed something up in the EPST settings, or maybe in the NV items... Not sure where, but something keeps kicking on the back door of my memory...
Any suggestions are appreciated. (even "leave the NV items alone if you don't know what your doing You IDIOT!!" Your gonna wreck your phone!!")

Wow, this is really strange.... When I try to run the MR2 update exe file, it says it is verifying info from my device... please wait. Then after about a minute, my phone LED flashes red one time and then it resets. After another coupla minutes the update util. says "This Update Utility cannot be used for your PDAPhone. Please check your Update Utility.
I'm using "Titan_VZW_SPL2.07_CE3.57.605.2_Radio3.37.78_S HIP"

Just tried to update Radio to 3.42.50 using a RUU from a previous DCD rom and pasting the Radio .nbh file into the RUU. The same error after it loads to 8%. RUU states Invalid command and gives the same BS as stated above... %$#@$!!

The RUU works fine to update the ROM to the DCD build.

[drewcam888]

Update radio from sd card and report your finding. Remember it must be 2gb or lower

I was trying to flash with SD card, and it would error (phone restarts after starting to update somewhere 0%-8%).
I thought I updated the post earlier, but I must not have hit the Post button....
Anyway, I had finally gotten the radio to successfully update to 3.42.50 after multiple rom/radio/bootloader changes using both SD flash and RUU.
This did not change anything. Still no service.
I am sure, at this point, that it is something I did with either EPST or QPST/CDMA workshop or DFS.
If anyone has a backup of settings for their Titan for one of these programs and would be willing to share, I would be EVER so grateful. I am on Verizon, so I believe I would need a copy of a VZW device, however, at this point, I would try any service provider. Any service registering is better than where I am currently.