Acer Iconia One 8 Service Manual page 21

SD card Install Download SOP
1. Put OTA image file on SD card
2. Fast key enter to recovery mode.
Press "Power" and "Volume up" key together(over 3 sec)  release "Power" key, but keep pressing the
"volume up" key, until recovery mode display popup.
3. Select " apply update from external storage, then press "power"key
4. Select the OTA image file, the press "power key" to start
5. When finish, select "reboot system now" item.
6. Factory rest, then SD card download image procedure complete.