Chicken-and-egg problem. Replacing the 2.1.04 rootfs with that of 1.7.13 will give you back GFT. You can do that by taking out the harddisk of your A705 and connecting it to a normal computer. Once you have 1.7.13 running again, you can read out the flash which will give us the AES-key for the A705. They could be added to the utility easily. But where to get a 1.7.13 rootfs from? Well, seems we will have to look for somebody to provide one first. Or a dump of the flash to get the AES key and take the rootfs from the firmware file...
I think I might have away into 2.1.04 - but whilst I wait for some hardware to test it - I like to have a look at the flash lock issue.
So - we need someone still at 1.7.13 , or someone who has taken an image of their hard disk when it was at 1.7.13.
Also - how does the AOS decryption progress in the real machine ? ( I see that archutil performs AES decryption to a temporary file first )
If the real machine performs the same way - then we might at least have the decrypted 1.7.13 by attempting to upgrade 2.1.04 with the 1.7.13 aos ?
( I know it's a long shot - but I can see that when I attempt the upgrade - avos appears to read the whole file before telling me it's not possible to downgrade ).