Hi there,
From where i can download the BB handheld software version 3.6 or 3.8.0.128. I have 7100T and i recently upgraded the hand held version to 4.0.2.69 from T-Mobile site. My BB became lousy now and i am bearly able to here the other person. I want to down grade the hand held version to 3.8.0.128 (the version with which my BB came when i bought). But couldn't get any where. Any help is highly appreciated...

The best way is to search in Forums with the red tab "Search"
This topic has been long and intensively studied here