Hello,
Could you try firmware update via bootloader menu, as instructed here?
Also, are you able to login to the device via SSH?
If you can, I would like you to generate and attach a troubleshoot file to your question. Please, replicate the issue, then login to the device via SSH, execute the command below (do not mind possible errors):
Download WinSCP. Login to the device using the downloaded application as instructed here. Navigate to /tmp directory. Find and copy troubleshoot file to your computer and attach the file by editing your original question.
The logs in the file might provide more insight into the issue.
Best regards,