What method did you try to update with? There are three:
1. Call *2 to get flagged, call *2 again to receive update (may take several calls to receive--try soft reset in between tries)
2. Unzip the file attached to my last post, put 20226.prl file on your phone, type ##PRL# via the phone pad, put in MSL and select the 20226.prl file, then soft reset.
3. Unzip the file attached to colonel's post, copy cab to device, execute cab, soft reset.
Oh, and FYI for any non-Sprint users reading
THIS IS FOR SPRINT ONLY. IF YOU AREN'T USING SPRINT THEN DON'T USE ANY OF THIS!!
That should do it