How to update FW to ver. 1.04 for M1+-2

3. You can either download ”M1+-2 OTA tool” APK from
“Downloads” in ViewSonic Website by searching model
accordingly.
4. To download ”M1+-2 OTA tool.apk” and save it to USB driver
with format FAT32, then plug it to M1+-2.
5.Power on M1+-2 and either go to “File Management”-> ”USB”-
> open “M1+-2 OTA tool.apk” or press input button to select input
source “USB” to enter this tab for opening “M1+-2 OTA tool.apk”.
5. Select “Install”.