iPhone How to downgraide to 4.1.2 fw ???

[cymolia]

For testing purposes i need to downgrade to that firmware, does anyone have a guide ? thank you ( im currently on 6.1.1 on 3gs, 4 and 4s)

 

[JPNFRK7]

For testing purposes i need to downgrade to that firmware, does anyone have a guide ? thank you ( im currently on 6.1.1)

What iPhone (3GS,4, 4S, 5)? We need more information.

 

[cymolia]

What iPhone (3GS,4, 4S, 5)? We need more information.

3gs, 4 and 4s, sorry will update orignal post

 

[TriJetHero]

4S can't be diwngrade from 6.x

3GS and 4 only if you blobs

 

[chambone]

Isn't Apple still signing 4.1 for 3GS?

 

[TriJetHero]

Isn't Apple still signing 4.1 for 3GS?

Yes but not 4.1.2

 

[glsillygili]

if you want to downgrade to 4.1 for 3gs you can downgrade

http://appldnld.apple.com/iPhone4/061-7938.20100908.F3rCk/iPhone2,1_4.1_8B117_Restore.ipsw

download this and shift(alt on mac)+ restore in itunes