thank you for your quick reply
a. I set le work at 1080@50p, and then I play a 4k@24p video. On the tv, input source is 1080@24p. Odd
b. dmesg.txt
Also, I tried different img
MXIII+ no wif
H8X+ random frozen after wifi connected (ap6335?)
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Under Meson8, handling UHD resolution is not really properly resolved. I'll be honest, I didn’t really struggle with 4K either.
Since HDR10 is not supported by the SoC, I didn't see the excessive sense of dealing with it.
Unfortunately, I can't suggest anything for WiFi instability.
However, it is worth noting that the M8S+ and 3rdParty images use different broadcom drivers.
Question: Would you be so kind to make a version for the Amlogic 905D with 1G ram / 8Gb eMMC too?
I didn't really plan to create more images on the 905x device branch.
The biggest problem is that Mecool's "M8S-Plus DVB" device has a WiFi chip (SCI 9082C) that was never released a driver by its manufacturer, so support for this chip is not resolved from the open souce side. 
The other thing is the tuner, in which I’m also not sure it works perfectly.
However, you can try my image for KI-Pro from an SD card by replacing the dtb with this:
gxl_p231_1g_dvb.dtb