Help Streak AT&T 2.2 how to make enable to install software from SD card?

[ore_ore]

My streak was locked for AT&T. I had unlock my streak ,and update to 2.2 ,yesterday.
But I still can not install any software from SD card. It only possible to install from market.

I want get root,then use engineering mode. because,I want make my streak useing all band for HSDPA.

Please,help...