Multiple issues with Thomson Neo 15 laptop

As a Linux exclusive user, when I bought my new Thomson Neo 15 laptop, I wanted to format the hard drive and install Linux without even looking at Windows 10, which was pre-installed. Now, I'm facing the worst problems: hard drive not detected, no wifi, and more. After numerous attempts, I managed to install PCLinuxOS with the (slightly retro) Trinity interface, then faced more issues (at one point, nothing works anymore, and the hard drive is no longer detected by the system), and after many tries, I finally installed Fedora 33.
But still no wifi, it works with a dongle though.
However, the problem that bothers me the most is that the keyboard doesn't behave normally.
When writing with TeXmacs, I can't move to a new line!
Using an external Bluetooth keyboard, I can move to a new line, but I no longer have a \ (backslash) (see my other question on the Forum).
How can I use my keyboard normally?
Is it a special type? Are there drivers (especially for Linux) for it?
I can't identify it with my utilities.
Thank you for your help!