help updating touch firmware

hello guys ...i have lg g2 sprint ls.... 980 after updating zvd to zve..my phone touch is not working properly...phantom touches ...random selection...are occuring...i have searched...and found touch firmware update might help.....but problem is there is no touch firmware update option....in hidden menu..
there are following options....
device test
elt test...
factory reset
log service
wvdrm services
there are suppose to be a hw device test menu......in which touch firmware can be updated...
or any other solution to get touch working....
.though i have also flashed back to zvd...but now nothing is working.....even not on lolipop....custom roms...zvc...
....tried every thing but problem exists