It's locked
Is there somewhere the original 1.0 FW to revert it back if it does not work right ?
Being a JTAG interface I would suggest dumping your original firmware first prior to flashing for an original image.
In that case I would suggest that would be quite difficult to achieve!
Wasn't there an image linked earlier that would return to stock? (from the BFL site)
The .hex provided by BFL is version 1.2.5, I don't think we'll be seeing an official release of v1.0.