I can't find any on Google that you can force to flash it. It seems that you can only flash it through the browser.

Can you disassemble the unit and take a picture of your control board. I just want to know the control board name so that we can use it to search for ways to flash it.

Or try to access it with the telnet command.

Here's the command.

Or use any SSH tool to access that IP and if it's asking for a password try to use root