User's Manual

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Backup the contacts, photo, music and
video les present in the phone memory,
as all the les will be deleted during
rmware upgrade .
6. Read the warning and precaution information and
click OK.
The complete download process takes
about 30-40 minutes and please wait till
the success message is displayed. Do not
disconnect or switch OFF the phone.
It is recommended not to make/receive
Calls during Upgrade process.
7. In the download complete screen, Click OK.
8. Disconnect the USB cable from phone.
9. Switch off the phone.
10. Long press Down navigation key and End key
simultaneously till the updates starts to install.
11. After the complete installation, success message is
displayed. Press the End key.
12. Power On the phone .
Sonim XP1520 phone is upgraded successfully to
the new rmware.
13. Restore the Factory settings. Select Menu >
Settings > Restore Factory settings > enter the
password > select OK.
The default password is 1234.
14. Select Yes to conrm the restore settings.
Upgrading Sonim XP1520 Firmware