I swear Verizon is trying to everything they can to force everyone onto .621 but that is just me.
Recently tried to fix my non-working GPS. Had to call Verizon to see if they could help. Everything they want to do starts with: "Go to settings, About, system update."

 

Other options are "factory reset" or sbf again.

I'm surprised you aren't already on .621. I know a guy at work who rooted his t-bolt and it was try to install the update several times a day, even tho he had disabled his updater until we cleared his cache.

 

Do you have a backup of a working rom you can restore? (something pre-miui?)

 

How about this: create a backup in recovery and Titanium Backup, making sure it's successful. Then factory reset, reboot.

Activate it, open Market, cancel update downloads and install your speedtest app.

If it isn't any better, restore your recovery backup and you won't be out anything, but a little time.

If the problems resolved, open TIBU, press menu, choose "batch", and restore missing apps + data. Do not install any system or user data (red/green items).

 

Have you tried *228 option 2?

I assume it's handled when you activate, but couldn't hurt.

 

Called 3G booster that helped me out a ton. You have to install the latest busybox and smanager from the market then run the program with SU checked and you should be better off. I had a buddy that was downloading at 175kb and jumped to over 600 after installing it and setting it to faster.

3GTurboCharger, V6 Supercharger And 98KickAssKernelTweaks By Zeppelinrox - xda-developers

 

I gave this a shot... My first attempt at runnign a script, and despite reading directions both here and after the links and following them to a 't' I keep getting the same errors...

line 4: syntax error: enexpected word (expecting "do")

I look at line 4, and there is clearly a "do" already there...................... I really hate syntax errors. Is there something I might be doing wrong?
I'm already on busybox 18.2 as suggested......

 

I use the latest busybox version and script manager for V6.

Make sure you run script manager as root (button at the top).

 

I just noticed that that script is a txt file mine is a pdf. I can't find another link for it. If you know a good way to share files somewhere I will post it up for you.

 

try this xda-developers - View Single Post - [Script-U9RC8.2]Be A Super User! Use The -=V6 SuperCharger=- Lag, Redraw & RAM Fixer!

 

V6 is for performance. I thought you wanted the 3G fix?

 

If there is a newer or better one I would like to have it.

 

There were 3 links to files on that page.... one was for V6 (which I've used), one was for the 3G fix (which I've never needed). Just make sure you get the correct one and use "SU" (superuser) option when you run it. I doubt the busybox version is that important as long as it's the full version. I use busybox installer from Market.

I right-click on the file to save the link to my computer, then copy to Dropbox, which I use to send to all my devices. You can also just mount your phone via usb and copy the file over, whatever works.