Sometimes, the WRN fails to properly boot up, and does not progress past the city logo, and the screen goes black, not proceeding further.

 

This article describes the steps to fix the WRN during a boot failure. 

Resolution

To fix a WRN boot failure: 

Copy fix_wrn_failboot_log_cs_250314.sh file that is attached to this article to a USB. 
 

Extract the files so that they are located in the root directory of the USB.
 

Connect a keyboard to the NVR and click Alt + F2.

The Shell Log In screen displays.


 

Enter the Ubuntu user ID (e.g., wave) and password.
 

Connect the USB containing the script to the NVR.
 

Enter the command 

udisksctl status

Identify the connected USB devices as indicated by the orange box.


 

Check the DEVICE entry for the connected USB (e.g., sdb, sdb1 etc).
 

Enter the device name after /dev/. The device name (the number (1)) after sdb is the partition. For example:

udisksctl mount -b /dev/sdb1

If a password prompt appears, enter the Ubuntu password.


 

Obtain the information of the mounted USB (e.g., /media/wave/A892-07D6).
 

Execute the script located on that USB

sudo /bin/bash /media/wave/A892-07D6/fix_wrn_failboot_log_cs_250314.sh

If success to remove wrn bug is displayed, it means the process has completed successfully.
 

Enter the reboot command to restart the system.