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@Hqnicolas Take a chill pill dude. I am not trying to prove/disprove anything.
I am simply suggesting that the board may indeed be of 8/64 config. Sometimes, due to screwed up u-boot, not all the RAM is reported correctly. And here, I can see that adding up the memory (3.8) and zram (1.9), it comes to around 6GB. Hence, I suspect the memory is still there, it's just not reported correctly because of the zram/swap thing. Removing the swap/zram completely may indeed show it to be 8GB.
 
On your note of TV boxes being unreliable, I never refuted your claim. I agree about the unreliability. At the same time, I own two of these x88 pro20 boxes (8/128 and 4/32) and looking at the chips and the markings on the board, I have certain confidence that it would be an 8/64 indeed.
And, I own a total of 4 tv boxes, and a total of 4 sbcs (2 raspberry pis, one orange pi 5 plus, 1 starfive vision V 2), so I know what to expect and how wild things are out in the tv box world.
 
I am sure you also know better than to claim to be the final authority on declaring all tv boxes as "unreliable"
 

@MMorales 
I think your board may still be of the 8GB RAM/64 GB emmc config. Why don't you try installing the armbian image for station m2 from here:  https://www.armbian.com/station-m2/
 
After flashing the image, change the fdtfile=rockchip/rk3566-firefly-roc-pc.dtb line in the boot/armbianEnv.txt file to fdtfile=rockchip/rk3566-box-demo.dtb
And also remove or comment out the line overlay_prefix=rk35xx

Final update, issue was with armbian-upgrade restoring the dtb to the original files. Skipping dtb update should be enough. I was also able to install to emmc by using the armbian-install script.
Everything seems to be running pretty stable so far. Thanks @mmie4jbcu for your help!

We don't have this board, but you can find users with this model in this link
you could also find people on https://www.t95plus.com/
use other topics as development path