Carrier Unlock currently jailbroken AT&T iPhone 6?

[GDubYa13]

About a month ago I switched from AT&T to T-mobile. I went through the AT&T unlock process and today AT&T finally unlocked my phone so I can now use on my new carrier. However to complete the unlock process AT&T says I must restore my iPhone through iTunes. The problem is that Apple as released iOS 8.4.1 which killed TaiG jailbreak, and, as far as I know, yesterday Apple also stopped signing iOS 8.4. My question is basically is there anyway I can restore my iPhone using iTunes and not be forced into updating to 8.4.1, or if i have to go to 8.4.1 is there any way to get back down to 8.4 so after my phone is unlocked I can "downgrade" and rejailbreak my iPhone. Again my iPhone 6 is currently jailbroken on iOS 8.4.

Thanks for any input!

 

[eyoungren]

You can try Cydia Impactor, but there really is no need to restore. Find a non AT&T SIM you can test with and insert it and see what happens.

 

[Applejuiced]

Like said above you don't need to restore.
Just connect to wifi and stick the new sim in and it will activate.
That's all.

 

[joju58]

Exactly... Done this before