I have not been on linux since last summer, I discovered this forum and nearly 2 years of troubled history with this mediatek chip. The proper drivers have always been out there in the mt7668sn repo, dating back to December 2020 when the MT6632 combo chip drivers for 5.10 (has an option for mt7668) were released, which could still be built under a 5.15 tree with 5 minutes of debug editing. What I have done to get wifi working since when I started PS4 linux in 2020 is clone the mt7668sn repo, edit the Makefile to be built in to the kernel, and build. After 3 years of sticking with the 5.10 drivers the maintainer rolled out the MT7663 combo chip drivers (also has an option for mt7668) for 5.15 which I immediately switched to. Today I will release the patch I use to make it built in to the kernel since these are the proper drivers since the ones shared here appear to be a finnicked version from the firestick android linux 4.4 kernel to just barely work on newer kernel versions. First download the 5.15 commit of mt7668sn from here, then you will download this: builtin.patch. After that you will take drv_wlan/MT7663/wlan, get that folder to drivers/net/wireless/mediatek and rename the 'wlan' folder you pasted there to 'mt76x8'. Your next step is to go apply the patch. After that the menuconfig will have the proper options for these combo chip drivers in "Device Drivers/Network device support/Wireless LAN/Mediatek devices". Big thanks to Chales Yu, he's contributed to many wireless drivers like mt7668sn. Two things to never forgot or WIFI AND BLUETOOTH BOTH WILL NOT WORK, firstly remember to enable Bluetooth at "Networking support/Bluetooth subsystem support/Bluetooth device drivers/MediaTek protocol support". Second don't forget to build the firmware into the kernel (search up Google how to build firmware into Linux kernel it's just some config options too, include every file from that noob404 firmware repo I just linked except for README, the README is to be deleted). After doing all that, you have a bzImage working perfectly with your Mediatek wireless chip.
