To get back to square one (UK 1.2) firmware-wise, take your
cramfs.Fsk.img file and copy it to the Universal Flasher SD card with the name new_opt.img - Insert the card into your Reader and from the Flasher menu choose #4, then #6.
(Warning: While I'm pretty sure the linked img is the one I used with no problems, when my brother tried it, his bricked & he had to reset back to 1.1 again! Will be interested to hear how you get on.)