Cisco SRP 521W - password recovery process

I have taken a new position with a company where they have 60 retail locations using the Cisco SRP-521W router.  The current MSP vendor either does not know or will not provide the "admin" account login information.  Since these are working, I can NOT do a full configuration reset.

Is there a process similar to what I would use for the Cisco 5505 to do a password reset for the "admin" account?  

Basically I want to be able to connect to the console; boot to ROMMON; change the boot startup config register; boot to IOS and then change the enable password; and then set the startup configuration register back to normal.

Thank you,
Jeff