I was attempting to do a h/w unlock an a 1.1.2 OTB that was jailbroken when i install the wrong file corrupted the baseband.

I have been able to restore the phone to 111 and 112 (note: with errors but i get activation screen) but i cannot get it back to 102.

I guess the question is can i upload the files manually? is so how? and continue to do a h/w unlock downgrade the baseband or is there another way...