Didn't you just said that you use a K810 firmware for your K800 phone?
Now you want to use the R8BA024 firmware version for K800?
If you want a K810 firmware just use the files pointed by me in my previous post.
Do not mix K800's MAIN, FS and CDA with K810 MAIN, FS and CDA files.
About the CDA versions, R3, R5 and R8 are revisions of the same pack and they are basically the same.