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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