First, let's look at the Flash files in the Cisco router. View with the show Flash command.
At this point, you can see that the Flash version is C1841-ipbasek9-mz.124-12.bin
Below we delete this Flash
After deleting the flash, we can see that flash is gone.
At this point, restart the router, the router will not restart.
Below we download the image from the TFTP server.
The download OS image must be configured, the TFTP server address and the IP address of the router, the image you want to download. Finally in the execution tftpdnld. You can download the image.
At this time input tftpdnld can download, will pop up a Do you wish continue? y/n then we can download the image by entering Y.
The system image has already been downloaded. We can simply enter reset to restart the system.
You can restart the downloaded system when you enter the car.
Then you can use the router.
Removal of flash through TFTP server recovery in Cisco