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If user has not bought the GPS option, the button is gray.
9.4 Software Update
When you need to upgrade software, contact our company for the latest firmware. Software can only be upgraded by
USB disk mode.
Before updating, copy upd_file.dat and upd_ver.txt into the root directory of the U disk. In the second page of the
System Menu, select the "upgrade" soft key, the below menu will pop up. Press the "OK" to upgrade, and press
"Cancel" to return to the previous screen.
Fig.9.18 Upgrade
It will display a graphic during updating normally. There will be prompt if update successfully. If the upgrade is
unsuccessful, an error message will be displayed on the screen for the failure reason.