Originally Posted by coallaw
Big problem after upgrading 8900 to 188.8.131.528. Actually worked great for everything on the phone BUT then I could no longer hook to DeskTop Manager. DeskTop Manager says is an incompatible OS. Causes me great heartache when I couldn't figure out how in the world I could downgrade back when I couldn't hook the phone to the DeskTop Manager. Finally remembered a trick a Tmobile Rep had taught me once. Take out the battery and then hook to DeskTop Manager. This worked. First of course I had to take the new OS off of my computer and put the old one on. Hope this helps someone else! P.S. Be sure and put the battery back in during the process so that the phone will be able to "reboot".
Now I had a similar problem with .314, but my DM with my mac has no problem with it.
I'm pretty sure you don't downgrade or upgrade using the DM (it is possible yeah) but why not just download the update yourself (assume you have since you have .348) and downgrade that way.
When you use an alternative way to upgrade you're most likely going to have to use an alternative way to downgrade, but you found that out already. haha