Need help phone freezing 2.2

[Umass021]

I updated to froyo 2.2 using Peter Alfonso version he posted. I also update the baseband C_01.43.01P he put out there and now my phone keeps freezing everytime I start it. I put it back to C_01.3E.03P and it is still doing it. Is there anyway to go back to the stock 2.1 or what can I do to fix this problem.