or create your own image if you prefer a different partition layout:
http://support.planetcom.co.uk/index.php/Linux_Flashing_Guide Note: The official partition tool does not offer a rooted android image at the time of writing (26/02/2019). The image advertised as rooted is the same as the non-rooted version.
Reboot the newly imaged Gemini into Android and:
Configure the keyboard
Connect to wifi
Open the "Play Store" app and sign in with your google account
Update all apps
2. Run Magisk Manager to finish the rooting process
Run the "Magisk Manager" app and follow the prompts to update the app
Sometimes the magisk version shipped with an android image is not compatible with the latest version of the magisk manager which will require a little workaround.
If you are prompted with an error message that "Magisk Manager" is incompatible with the installed version of "Magisk", downgrade the manager app, upgrade magisk via TWRP, and upgrade the manager app again like this:
Continue with the installation of TWRP and install the new magisk version via TWRP when convenient. Once installed open the "Magisk Manager" app and follow the prompts to update the app
Note: Newer versions of Magisk seem to be breaking auto rotation. Let's stick with the previous version for now.
3. Install TWRP recovery
install the "Official TWRP App" from Playstore
open the "Official TWRP App"
select your account
tick "I agree", "Run with root permissions"
press "TWRP Flash"
press "ok when prompted for allowing root access
If superuser permissions are not granted automatically, open Magisk Manager and enable TWRP manually