I installed from TFTP via the bootloader / UART header, then had to install LuCI manually as it's not in the snapshot builds.
Status of mt76x0e from dmesg (Kernel Log):
[ 15.226924] mt76x0e 0000:02:00.0: enabling device (0000 -> 0002)
[ 15.233219] mt76x0e 0000:02:00.0: ASIC revision: 76100002
[ 15.243342] mt76x0e 0000:02:00.0: Firmware Version: 0.1.00
[ 15.479249] mt76x0e 0000:02:00.0: EEPROM ver:01 fae:00