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
Gemini Partition Tool - Android 8.1/Linux
For the old partition tool (Android 7) please see
Please select the wanted partition size for Android and for Linux by dragging the planet left and right:
Please Choose your Gemini version
Gemini 4G (x25 or x27)
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.