Flashing via OEM WebUI:
1. Download the firmware image *-squashfs-factory.bin
2. Upload firmware image via OEM WebUI firmware update, do not keep settings
To revert back to OEM firmware:
https://wiki.teltonika-networks.com/view/Bootloader_menu
Signed-off-by: Simonas Tamošaitis <simsasss@gmail.com>