Note: The first 5 GHz radio (IPQ4019) is limited to ch. 36-64. The second 5 GHz radio (QCA9886), is limited to ch. 100-140. This is consistent with OEM firmware and is a result of the ART data and the data in the OEM firmware's cal data.
Note: Reset router to factory defaults if it has been previously configured. Installing OpenWrt on this device requires a two-step process, first writing the initramfs image from the OEM firmware - and then finalizing the installation by sysupgrading the real device firmware.