k800i to k810 helppp

Hey guys i'm new to this forum so forgive me if i sound stupid. I'm trying to update the firmware on my k800i to k810 using xs++ but it says that my phone isn't supported. A couple of months ago i updated the original firmware that the phone came with to the current version R1KG001, CID 53, I really can't remember if I used SEUS or XS++, I dont know if that makes a differnce or not.

Also which files would I have to use, I downloaded K810_R8BA024_FS_EUROPE_2_RED52 and K810_R8BA024_MAIN_GENERIC_SM_RED52 are these the right ones, my phone was bought from o2 and I had it unlocked by a shop when I bought it.

One last thing if there is anyway that i can updated to k810 would i be able to flash the phone so that it has a cool new menu because i cant right now it says phone not supported and if not can i put it back to the original firmware so that i can.

Thank You :(:(:(

you need this Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums because you've used SEUS and that means you have CID53 phone