DownBB - by James. (a.k.a. EvilPenguin|).
To run DownBB, you must first put my repo/source in cydia sources: http://nakedproductions.us/source
soon to be on bigbosses as well
Open MobileTerminal type "DownBB" -without the ""
To check your bootloader version, install minicom and run at+xgendata (see Baseband Commands for more info)
Place the DownBB.deb /var/mobile/ ssh root@XXX.XXX.XXX.XXX su *password* dpkg -i DownBB.deb Then follow the How To's