can't install verizon's new TB update

Hi everybody. I got my Thunderbolt the first week that it came out and have loved it. I rooted it and loved it even more. Then these Verizon update requests kept coming in and coming in. I rejected them and planned to keep doing that until the other morning they forced it on me. The update failed because the phone was rooted I assume. Whenever the phone tried to install the update and reboot I keep getting the android next to an exclamation point. I then press menu and go to clockwork mod and it has a list of options. I've tried them all. My latest, last resort has been to factory reset the device and sign in all my accounts just so that I have a phone. I even formatted the SD card hoping to get any update files off for a normal reboot. Verizon is still pushing the update and it still fails to install every time, giving me the error image:



at this point I'm not even worried about having a rooted phone, I just want my phone to be reliable and not to be hassled by Verizon every five minutes to update my phone. I've tried setting it back to stock using the instructions here:
[HOWTO] Restore to stock for root users and non-root users UPDATED 5/17/2011 - xda-developersut get an error that installation was aborted because of signature error. Any suggestions would be appreciated. FYI, I can't post to the above linked thread because I do not have enough clout on their site.

 

I was trying to use Jcases unroot also and didn't realize or remember that you have to hold volume down and power at the same time to enter hboot. I read through the replies to his unroot method and figured it out. So, I'm back to the stock ROM but the update still fails. The message I get now is "download failed." It doesn't try to reboot or anything. At least now it is back to stock so I can talk to Verizon about the problem and have a stock phone with no trace of it being hacked. Any ideas why the update won't install or what I can do? Also, if and when I get the update installed can I root it again? Thanks.

 

I flashed both downloads first the large file (longer install) and then the smaller shorter install. It's finally back to stock and I'm working around the update. I'll go to Verizon and do the download eventually. This might be a dumb question but with the method for rooting the TB, you have to revert to a previous version which will not include the update, correct?