Point Mobile PM90 - Update Operating System (FOTA); Access FOTA Update Options; Download OS Image via FOTA

PM90 Android 9 User Manual
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OS Image update from a Storage
OS Update
By touching the OK button, your PM90 start to update the
OS image.
Please save the data before restart to complete OS update
process.
Note: Remaining battery level must be higher than
20%. Otherwise PM90 will not start OS update process.
Please check battery level first