Upgrade 4.4.2 --> 4.4.4 with other device's SHSH?

Got a pair of ATV2’s here.

Some of them are at 4.4.4, fully jailbroken. Some are 4.4.2…

Tried about every trick in the book now, leaving one left - upgrading with SHSH from another device.

I’ve seen it has been mentioned, but no one has confirmed it working(??)

Posters claim that the device gets stuck in DFU mode while attempting to restore 4.4.4 with different blobs.

yes it does work.i can confirm it.from 5.1 to 4.4.2 to 4.4.4.all with shsh blobs from other devices.once you have the new signed ipsw and do your restore in itunes.when you get error 1600 use seasonpass and teether boot.it will work