@Sunshine Thanks for firmware. I try upgrade over web interface, but after showing the dialog of upload firmware on 100% and wait reboot, see message: Error code: 71211 Failed to upload upgrade file....

All subsystem was working ok. After switching "Operation Mode" from "3G/4G Router Mode" to "Wireless Router Mode" and reboot, SIM card is not work and web gui have error on every page: Error code: 1...

@Sunshine hi, i have same problem, please help, can i download last 5.3 firmware?