I got my phone k750 with cid49 with RD B001 firmware in working order, it is finally unlocked in servic center using se box, of course not for free, unlock took only 2 minutes. thats it! i really enjoy the phone. sad thing is camera is not working, in service menu there is no mention of camera driver. i opened the phone till i got camera cable and refixed, it did not help. hope it needs camera driver. i will try to fix and come back to you some time later.