Cisco ISR4300, user credential is not working and password recovery disabled, How to recover the access to the router

Cisco 4331, user credential is not working and password recovery disabled

Step by step solution to recover the access to the router

First, make sure you have a configuration backup because this following step will erase all the config

Console to the router, using Terra Term

Power cycle

System Bootstrap, Version 11.1(4675) [kluk 143], INTERIM SOFTWARE
Copyright (c) 1994-1996 by cisco Systems, Inc.
C3600 processor with 32768 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled

PASSWORD RECOVERY FUNCTIONALITY IS DISABLED
program load complete, entry point: 0x80008000, size: 0x2733f4

When I see the word "Password Recovery Functionality is Disabled"

Send CTRL Break

It will prompt a question to Reset to factory default

PASSWORD RECOVERY IS DISABLED.

Do you want to reset the router to factory default

configuration and proceed [y/n] ? y

Reset router configuration to factory default.

It should boot to router prompt

Now, you can re-configure it again

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