@SeattleSunshine
You can use the uboot webUI to load openwrt, power on the unit with the reset button pressed, then access 192.168.1.1 (http, not https) and drop your sysupgrade image there.
@Johnex
Actually on ipq40xx targets performance is almost identical. Its the ipq80xx that really benefits from Qsdk (enables the NSS cores).
Apologies if openwrt is offtopic here, but given we are discussing GL.Inet products, I figured it would be fine