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According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command.

https://www.oreilly.com/library/view/cisco-ios-cookbook/0596527225/ch01s06.html

R1#erase ?
  /all                       Erase all files(in NVRAM)
  /no-squeeze-reserve-space  Do not reserve space for squeeze operation
  flash:                     Filesystem to be erased
  nvram:                     Filesystem to be erased
  pram:                      Filesystem to be erased
  slot0:                     Filesystem to be erased
  startup-config             Erase contents of configuration memory

R1#erase nvram: ?
  <cr>

R1#erase nvram: 
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete
R1#
*Mar  1 00:07:24.891: %SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvram
R1#

I also tried erase startup-config and reload

The problem is nothing happens after that. It just stop responding right after reload command entered.

R1#reload 
Proceed with reload? [confirm]

I did not get any prompt to proceed with reload as shown in the link above (or just refer to example below).

Router1#reload

System configuration has been modified. Save? [yes/no]: no
Proceed with reload? [confirm]<enter>
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  • 1
    What do you mean “nothing happens “?
    – Ron Trunk
    Apr 4, 2020 at 2:29
  • @RonTrunk, I've updated my question. It just stop responding right after reload command entered.
    – Sabrina
    Apr 4, 2020 at 2:36
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    Are you connected to the serial console port at the default settings? (9600 8n1) It does take a minute for the system to POST.
    – Ricky
    Apr 4, 2020 at 2:57
  • @RickyBeam, yes .. console, not physical bu virtual as this running on GNS3
    – Sabrina
    Apr 4, 2020 at 3:12

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