Hi Freemangordon,I already tried with both(kp52 and kp53)
First I install u-boot and backupmenu
*install manually kernel-power(power,modules,headers,bootimg,flasher and settings)
*install community-ssu-enabler
*run community-ssu-enabler(just press on him)
*thum2 installed correctly(before reboot the phone it's shows one title your oper.... system is updated.....)
*till here(black screen)
regards
note:this is not my first install thumb2 I have other n900 and hi working without any problems with thumb2