Notes:
Boot 1 supports only Android, rooted Android and Sailfish
Boot 2 and Boot 3 support Android, rooted Android, TWRP, Debian and Kali

 
 

Press buttons to download the needed firmware files:

Firmware List (including older versions) and MD5 checksums

For the old partition tool (Android 7) please see here

Please select the wanted partition size for Android and for Linux by dragging the planet left and right:

 
android linux
   
Android Linux
   
   
Please Choose your Gemini version
Boot 1 - default OS, this is the OS chosen at boot if no button is pressed
Recovery mode, when booting, press and hold ESC (On) until the screen turns ON to boot into recovery mode.
Boot 2 - when booting, press and hold the side button until the screen turns ON.
Boot 3 - when booting, press and hold both the side button and Esc (On) buttons until the screen turns ON.