[Geremia]

Excellent instructions here:

Process[list][*]Go to the decryptBooxUpdateUPX project page on GitHub, download the zip and extract your project folder.[*]Run the following command:

pip install pycryptodome

[*]Download the firmware for your Boox device from Onyx's website. Drop the zip file into your project folder and extract the update.upx file.[*]Then run

python DebooxUpx.py Poke3

(or the name of your device). We now have a decrypted file called update.zip. Extract files.[*]Install Magisk by downloading the apk from Github.
[*]Drop both the boot.img file and the magisk apk onto your Poke3 or Leaf.[*]Install the Magisk apk and open. Click Install. Click Next, then tap "Select and Patch a File" Select boot image, then select "Let's Go".[*]After a couple minutes, the process will complete and you should have magisk_patched-24100_T5qRP.img on the Downloads directory (your image filename may vary). Move that file to your computer in the project directory.[*]Run

adb reboot fastboot

which will boot the e-reader into fastboot mode. Note that this mode only displays only the Onyx logo.[*]To make sure root has been achieved, we'll boot the image before flashing:

fastboot boot magisk_patched-24100_avvzI.img

. After several seconds, device should boot with temporary root access. You can confirm root has been acquired by opening Magisk. Under "App", it will say "Installed: 24.1" (or whatever version you're using).[*]To flash the patched image permanently, again run

adb reboot fastboot

. Once on the Onyx screen appears, run

adb reboot fastboot flash boot magisk_patched-24100_avvzl.img

.[*]We have root!