Can u downgrade the 3.1.3 mc bootrom to old bootrom?

[ze22ab]

I have a quick question, iv upraded to 3.1.3 with the mc bootrom. I was wondering can I downgrade to 3.1.2 with old bootrom?

My iPhone info
3gs 16gig
version: 3.1.3 7e18
model: mc131x
modem firmware: 05.12.01

please let me know,
thanks

 

[Wiltron]

Only if you've saved your SHSH keys on Saurik's Server (Cydia)..

If you have not previously jailbroke your phone, then no you can not Jailbreak until 4.0