How to downgrade modem firmware 05.16.07 to 5.13.04
 

I have 3gs ios 5.1.1 for unlock i need modem fimware 5.13.04 now have 5.16.07 ho to solve

install first Ipad baseband 06.15. then downgrade to 5.13.04, using redsnow 0.9.12b1 , and after that jailbreak and install ultrasn0w..

You can't do that thing 1st you need to update baseband To iPad Baseband 1st i mean (6.15). Then you can downgrade baseband to 5.13...

Note :- Some phones dosn't support iPad baseband! That will Brick youre iPhone Check this thread before updaing BB
http://forum.gsmhosting.com/vbb/f456...-info-1490277/

Br

Tabrez khan...

Very intresting tips, whether iphone checker work properly, did you tested???

Yeah for me iPhone checker works fine :) If You still having doubt about that you can open you're Phone And check that Phones BB chip :D http://forum.gsmhosting.com/vbb/f456...-info-1490277/

BR

Tabrez Khan..