Step 1

Connect up a console cable and power on the switch, whilst holding down the "mode" button:

This interrupts the boot process before the Flash file system can initialize, and after a short while you will see the following prompt:

Using driver version 1 for media type 1 Base ethernet MAC Address: 4c:30:2d:81:ef:80 Xmodem file system is available. The password-recovery mechanism is enabled. The system has been interrupted prior to initializing the flash filesystem. The following commands will initialize the flash filesystem, and finish loading the operating system software: flash_init boot switch:

Step 2

Run the following command to initialize the flash file system:

Switch:flash_init 

switch: flash_init Initializing Flash… mifs[2]: 10 files, 1 directories mifs[2]: Total bytes : 1806336 mifs[2]: Bytes used : 612352 mifs[2]: Bytes available : 1193984 mifs[2]: mifs fsck took 1 seconds. mifs[3]: 0 files, 1 directories mifs[3]: Total bytes : 3870720 mifs[3]: Bytes used : 1024 mifs[3]: Bytes available : 3869696 mifs[3]: mifs fsck took 0 seconds. mifs[4]: 5 files, 1 directories mifs[4]: Total bytes : 258048 mifs[4]: Bytes used : 9216 mifs[4]: Bytes available : 248832 mifs[4]: mifs fsck took 0 seconds. mifs[5]: 5 files, 1 directories mifs[5]: Total bytes : 258048 mifs[5]: Bytes used : 9216 mifs[5]: Bytes available : 248832 mifs[5]: mifs fsck took 1 seconds. — MORE — mifs[6]: 566 files, 19 directories mifs[6]: Total bytes : 57931776 mifs[6]: Bytes used : 28429312 mifs[6]: Bytes available : 29502464 mifs[6]: mifs fsck took 21 seconds. …done Initializing Flash.

Step 3

Delete the config.text file from the flash directory:

switch: del flash:config.text
Are you sure you want to delete "flash:config.text" (y/n)?y
File "flash:config.text" deleted

And Finally, Delete the vlan.dat file from the flash directory and reboot the system

switch: del flash:vlan.dat
Are you sure you want to delete "vlan.dat" (y/n)?y
File "flash:vlan.dat" deleted

To reboot the system:

switch: boot Loading "flash:c2960s-universalk9-mz.122-58.SE2.bin"… — System Configuration Dialog — Enable secret warning ———————————- In order to access the device manager, an enable secret is required If you enter the initial configuration dialog, you will be prompted for the enable secret If you choose not to enter the intial configuration dialog, or if you exit setup without setting the enable secret, please set an enable secret using the following CLI in configuration mode- enable secret 0 <cleartext password> ———————————- Would you like to enter the initial configuration dialog? [yes/no]: % Please answer 'yes' or 'no'.

You are done!