tomtom one v3 screen calibration????

hiya all

is there any way to re calibrate screen as taps/touches register half way down when you tap/touch top of screen so top icons dont register, had a look in section with how to calib screen by adding cal.txt but when i do that and re boot even with original x and y in text the screen is totally unresponsive, changed values and still same, only way i get some response is to remove cal.txt (useing navcor 845 via downunders installer)

problem was there with original navcore and adding cal.txt to that did nothing even if values changed

or is it a case of digitizer needs replacing??

If you can't get it calibrated a new digitizer is the next best option.