Dell Streak 2.1 Update1

Hi,

  I bought a dell streak SIM free from UK with following details

   BaseBand Version: GAUSB1A121100-EU

     Kernal Version:  2.6.29-perf

     OEM: GAUSB1A121100

      Build No# 10350

      Firmware : 2.1-update 1

I have updated it with Froyo2.2 but I don't like it. I want to go back to original Version as above. Please help me to get the download Link. Your immediate help is highly appreciated.

Thank you