For a variety of reasons that I understand and accept, GL.iNet builds their OEM firmware for the ipq40xx-based devices using QSDK. As a result, there isn't a robust path to directly flash "vanilla" OpenWrt from the OEM images. You should be able to use U-Boot to flash a vanilla OpenWrt image.
From the original commit message
commit 04d3308b62
Author: Dongming Han <redacted>
Date: Thu Dec 7 20:48:19 2017 +0800
ipq806x: add support for GL.iNet GL-B1300
This patch adds support for GL.iNet GL-B1300
Specification:
- SOC: IPQ4028 / QCA Dakota
- RAM: 256 MiB
- FLASH: 32 MiB
- ETH: Qualcomm Atheros QCA8075 Gigabit Switch (2 x LAN, 1 x WAN)
- USB: 1 x 3.0 (via Synopsys DesignWare DWC3 controller in the SoC)
- WLAN1: Qualcomm Atheros QCA4028 2.4GHz 802.11bgn 2:2x2
- WLAN2: Qualcomm Atheros QCA4028 5GHz 802.11a/n/ac 2:2x2
- INPUT: one reset and one WPS button
- LEDS: 3 leds: Power, WIFI(only for 2.4G currently), and one reserved
- UART: 1 x UART on PCB (3.3V, TX, RX, GND) - 115200 8N1
Installation:
Method 1:
- use serial port to stop uboot
- uboot command: run lf
Method 2:
- push down reset button and power on
- wait until three leds constantly on then release
- upgrade by uboot web at http://192.168.1.1
Note:
- the sysupgrade image need to be renamed to lede-gl-b1300.bin in both method.
- the sysupgrade image can be automatically downloaded if tftp server at
192.168.1.2 have that file.
- the wifi led will be flashing when writing image.
Signed-off-by: Dongming Han <redacted>