I just installed the new 3100 patch to my ppc6601 with no issues.

-soft reset
-full backup
-soft reset
-copy .cab to windows dir, unpack.
-soft reset

seems to place and recieve calls fine on my HBH-300 headset. I will test it further over the next day to see if it maintains its pairing reliably.

I do not yet have a bluetooth card to use DUN with my thinkpad but I should have one in the next week along with a BT GPS to test out with the new BT patch.