This is not the solution for Manjero but the information here might be useful for anyone looking for a fully functional operating system to replace Windows 10 on the Linx 12x64.
I Used the driver from here and did the following running Nobara-40-KDE-2024-08-15.iso Live.
Unzipped the driver file and opened the files folder.
Used “Open Terminal here” command from the context menu.
In the terminal ran sudo cp 4345r6nvram.txt /lib/firmware/brcm/brcmfmac43455-sdio.txt and then sudo modprobe -r brcmfmac && sudo modprobe brcmfmac
That was it. The WiFi worked I entered the password and connection was established and ran the install.
After rebooting I needed to make the same modification again to enable WiFi before carrying out a full system update.