Wirelessly posted (Blackberry Pearl 8100)

I have a blackberry pearl 8100 Tmobile. I tried to download the upgrade handheld software. I currently have V4.2. Tmobile does not offer the upgrade yet. When I installed the software where you delete the vendors license my phone kept rebooting itself. I am wondering if there is a way to fix this or should I wait until tmobile comes out with their own version?