Enter the background of the router and run the following command
- cd /
- mkdir firmware
- cd firmware
- wget https://fw.gl-inet.com/download/RM520GL-modem_firmware/RM520NGLAAR03A03M4G_01.201.01.201.zip
- unzip RM520NGLAAR03A03M4G_01.201.01.201.zip -d RM520NGLAAR03A03M4G_01.201.01.201
- QFirehose -f RM520NGLAAR03A03M4G_01.201.01.201
- reboot