Change Boox Note firmware

I bought an ONYX BOOX Gulliver (Note) (link: which I understand is the same version BOOX Note. It works well but the latest firmware update is from April 16, 2019 (available on: I recently realize that there is the V2.3.1 firmware update for BOOX Note (available on: the same firmware version I have installed on my BOOX Max 2 which has some cool features that I would like to have on my BOOX Note in order to make those devices more compatible (synchronization, etc.).

I know those firmware versions aren’t compatible then I would like to change the firmware and install the one.

I would really appreciate if you could help me to do that.