youll need to jumper the points, then you can flash from evox (unless you have winbod...i dont think evox can flash a winbond)
yes, you can restore your retail bios as long as you leave the TSOP write enabled (leave the points soldered)
since you have a 1.3 you may have a winbond chip, in which case youll need raincoat, but you can run the XBE from evox since your box is already softmodded