how to remove this software

Posted by shahraiz
huy guyz.... im in severe problem,i upgraded my w800 to the new software R1BC002,which is actually for k750...but it has distorted my bluetooth...i cant search 4 other devices and if i can, the connection fails and range is very much reduced,, how to remove this software . i will install the prvious R1BC008..pls give ur views,,, i also tried master reset but software remains same