Hey, U guys are doing awesome job - and have sollutions to everything. Thanks!!! I did update on my F90BT. It worked fine for a day. For some reason the calibration went bad. I tried to Recalibrate the screen but coundnt navigate at all. I did reinstall system n copied the files, and i came up to new proble. the unit will not start at all!! (except testmode start) Have any of you came across this situation? Is there a chance of corrupting any of the sysytem files? Thank you for your help