R58 A910 reflash back to BTUK R57

[biohead]

Is there anyway possible to flash an A910 that has had an R58 file flashed at one point, back to the BT-UK R57 file? I'm guessing not.

Although p3t3r says he had an R58 file and put most of the BT-UK items into it and to ask him for the file. As he is no longer active, does anyone on here still have this? THIS POST

I intend to try and use the BT Fusion service if there are any other methods that would work.