You should flash your phone using the last release of XS++ (3.1) because it's more stable, easier and faster than SETool2 Lite. Moreover, it has always been a step ahead...

For your phone, the K800i, the latest firmware revision is R8BA024.

If you just want to update your phone, launch SEUS. Contrary to that, whether you wanna also debrand your K800i, you'll have to flash your phone with one of the software listed on the top.

Bye. :D