MT7927 / MT6639 firmware missing in linux-firmware (PCI ID 14c3:6639)

[HarryFlashman]

Hardware:
MediaTek MT7927 (WiFi 7 combo device)
PCI ID: 14c3:6639
Motherboard: ASUS ProArt X870E Creator

Ubuntu 24.04.4 + kernel 6.17.

The mt7925e driver loads correctly, but the required MT6639 firmware
is not present in linux-firmware.

Without the firmware, dmesg reports:

Direct firmware load failed with error -2
mediatek/mt7927/WIFI_RAM_CODE_MT6639_2_1.bin
mediatek/mt7927/WIFI_MT6639_PATCH_MCU_2_1_hdr.bin

WiFi works once the following firmware files are installed:

mediatek/mt7927/WIFI_RAM_CODE_MT6639_2_1.bin
mediatek/mt7927/WIFI_MT6639_PATCH_MCU_2_1_hdr.bin

Bluetooth also requires:

mediatek/mt6639/BT_RAM_CODE_MT6639_2_1_hdr.bin

These blobs were extracted from the ASUS Windows driver package:

DRV_WiFi_MTK_MT7925_MT7927_TP_W11_64_*

Once installed in /lib/firmware/mediatek/, both WiFi and Bluetooth
initialize correctly.

Just reporting in case the firmware should be added to linux-firmware
for MT7927 support.

[MarcEspuna]

I managed to get MT7927 Wi-Fi working on Ubuntu 24.04 and packaged the working fix here:

https://github.com/MarcEspuna/mt7927-linux-wifi-fix

The repo now includes:

• the patched MT7927/MT7925E driver source we used
• installer / rollback / validation scripts
• a documented firmware extraction/install flow from a user-supplied Windows MT7927 package

This was generated fully by gpt5.4. I haven't checked the patch but it looks to be working well. Just posting it here in case it's useful for anyone.