TODO: Document older versions (well we can't because the bootloader can't be downgraded).
The OP-1 has a boot menu for running tests and uploading firmware etc. To access it hold down the COM button and power on the unit.
TE-BOOT v2.13
1. Upload firmware
2. Function test
7. Factory reset
8. Format drive
Pressing the relevant numbers on the keyboard runs the different functions.
In addition to the listed functions there are at least two hidden ones: Shift - 3: Extended function test Shift - 4: Flip display mode (WARNING: this flips the display vertically. You can flip it back by rebooting into the boot menu and pressing Shift - 4 again.