Power on the router and quickly press Ctrl+B when prompted to do so, in order to get to the Boot Menu.
If you are prompted for a password, use 8090 which is the default one unless it was changed too.
Then choose option 5. Set boot file and path followed by 4. Modify the config file to get the startup saved configuration file name.
Once you have the startup configuration filename (in this case cfcard:/vrpcfg.zip), go back to the main menu.
Step 2: Rename the startup configuration file
In order to rename a file you need to enter the hidden menu using the Ctrl+Z key combination.
Choose option4. Rename file in CFcardthen1. Change File(s) name In CFcard
Step 3: Reboot and save
Finally go back to the Main menu and choose option 11. Reboot, please make sure the MPU you are connected to (via the console cable) will boot as the master board, otherwise you will have to redo the same steps on the other MPU.
Once the router has completely booted up, save the current configuration.
Alternatives
Take out the CFcard inside the MPU, then use a CFcard reader to erase or rename the startup configuration file.
If you have access to the CLI then you could simply use the reset saved-configuration followed by a reboot.
Enter the Hidden Menu then choose 5. Disable config password option if you want to remove the passwords but keep the configuration file as is.
Kick it until all LEDs start blinking in red, then wait for few seconds
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