Take a USB stick and plug it in a working device.
Run the request system snapshot media usb partition command.
When you have a snapshot of the working device on the USB stick, it can be plugged into the device that has the issue.
Run the request system reboot media usb command to verify if the snapshot is working on the device that has the issue.
Finally, you can save the snapshot via the request system snapshot media internal partition command.
The device should now work normally.