How to hard reset navman f15, my navman f15 device is frozen and cannot be used.

SOURCE: upgrading map on navman f15

same thing here and now when i turn it on the screen is a total different color like when i first got it everything was green now it kinda looks like night vison goggle stuff

SOURCE: NAVMAN F15 MANUAL

Check this;
http://www.netonnet.se/images_Site/item_img/se/diverse/pdf/F15_SE.pdf

SOURCE: my navman f15 is stuck on loading maps

you need to reload software or send it to a repair centre .
Try this one www.satnavservice.com

SOURCE: navman f15 has a fatal application error displayed

hi,i have navigator with model s50 3d navman.i want set gwes.exe
what do i do?

SOURCE: my navman f15 will not

the reason your device does not receive any signal is because the baud rate and com port might be wrong. go to settings and fing GPS port, after entering choose auto choice so it can take the suitable gps port and baud rate