@k.nacke Just to present myself, new owner of a branch new (never started) M8 TB-8505X 2G/32G -CH
Receive the "beast" this afternoon, and now charging (build in 2022, and never started since) 
I'm still crawling the different information, especially the first steps. Doing OSS support for leaving, I'm not afraid to help, and should be also able to provide some merge request in gitlab (doc, test whaever I can)
My question for the moment is more like any newcomer:
Ok I got the device, what is the next step ?
- Shall I spend a few time to grab the lenovo support assistant and stock image
- Shall I do a backup of the existing rom ? but how to do that
btw I'm using openSUSE Tumbleweed as daily and don't have any windows (except on VM),
My main objective with this tablet, will be transfer from my action cam sd card to a luks external nvme ssd all the nice road I'm riding with my bike.
If I can browse internet a bit with, that would be a plus, if I can connect remotely my main computer with ssh and terminal great ...
Hope to get in touch (no joke here ...)