[BPI-R4] Successfully upgraded 8GB RAM on BPI-R4

I can buy K4ABG165WB-MCWE chip. Any reason why this not working?

mediatek: Add 8GB builds for Bananapi R4 by frank-w · Pull Request #21437 · openwrt/openwrt · GitHub was merged and a release came but the pr was not mentioned…? i dont get it, do i still need to do this trick for the 8g? or just download latest version?

If pullrequest is inyour codebase you should get a 8g sdcard image. I guess it is not included in 25.10 release as it was merged later.