are you sure it was never locked? did you buy it in a store thats reliable? or did you buy a used one? a k800i cid52 can be unlocked with ease. but if you update with SEUS the lock will return. and reflashing it won't remove the simlock. also it happens that store's unlock the phones themselfes and the resell it (yes in some country's like the netherlands it is allowed to unlock phone's and sell them. this was highly popular with the Iphone btw) anyway it's indeed impossible to restore the eprom from CID52 now that it is CID53. the only thing you can do is waiting untill CID53 patching is free/possible