If you still have the Mint 19 installed could you try
Code:
dmesg | grep brcm > brcm.txt
I may not have made myself clear.
Boot into a live session of
Mint 20 then run
Code:
lspci -vn > lspci.txt
and could you also try
Code:
dmesg | grep brcm > brcm.txt
and attached both text files.
I suggest this as due to your claim that Mint 20 gets you wifi.
The output of dmesg will also be useful.
When you say the system lacks stability what do you mean. What issues are presenting.
This is a link to the Mint 19 iso I created.
drive.google.com/file/d/1d7IEscVlyWoNZQe...s4D/view?usp=sharing
If you would like to test this for stability you are welcome to. Some of the repos no longer exist, but that is not the point. The point is to test if the kernel on this ISO will give you better/any stability. This will give you a full installation of Mint 19 with a PREEMPT kernel & linuxcnc.
Just had a look at the iso, the firmware is there for the wifi chip, all that is missing is the nvram text file.
If it is stable and you want to run with it we can sort the repos out as it is quite simple.
Or send the thing down to Sydney and I'll get it going by hell or high water :lol:
Oh ok this seems to be the same CPU that was used on the Atomic Pi, not exactly the fastest one out there. Even when I tried it with LXDE it wasn't the greatest
Sorry if this post is a bit all over the place, but I'm willing to answer any questions you have.