I can confirm:
mecool km3 (2020) corporate/rare editions with mtk WiFi chip from mecool km1 runs awesome smooth with Your x96max old revision v311P ATV firmware

(mecool km3 with
KM1 2T2R V1.2 boards (
atv android v10 out of the box) (X2, DDR3 I guess) (i have tried all of the ugoos ports too, but wifi never works) i guess because of the old ddr3 chip combination?
with your awesome last build Bluetooth isn’t working so the original remote control is not recognized too) but I don’t care

because of my air mouse remote)(sleep works just via internal sleep button , wakeup works) but led is permanently red (i tried EVERYTHING)
Pretty fast and stable (iptv, Netflix in uhd and Amazon Prime, Perfect for daily use)
It’s the best Android TV firmware mod ever (not only for this **** mecool km3 box versions)
I made a package of new additionally mods/apps/tweaks on google drive maybe you like some of it too (text me)
Big up and my respect to the slimbox tv software crew !
Best wishes and Thank You for Your hard Work!
h96max Для старой ревизии v311 p с 4GB RAM
h96max For old revision v311 p with 4GB RAM
https://slimboxtv.ru/glavnaya/x96max-x2/294/