cisco catalyst 3640 read only file system

[paul dungey]

HI,

I have a customer switch that requires the configuration to be reset back to factory defaults but I'm getting a message,

Cisco Catalyst 3640 48 POE 4 x1G switch

File "flash:nvram_config" not deleted -- read only file system,

I've not come across this before so I would need a step by step support

output from switch

switch: dir flash:
Directory of flash:/

16161  drwx  4096       .
    2  drwx  4096       ..
16162  -rw-  79121160   cat3k_caa-base.SPA.03.03.03SE.pkg
16163  -rw-  6484668    cat3k_caa-drivers.SPA.03.03.03SE.pkg
16164  -rw-  34522096   cat3k_caa-infra.SPA.03.03.03SE.pkg
16165  -rw-  34821452   cat3k_caa-iosd-universalk9.SPA.150-1.EZ3.pkg
16166  -rw-  25131920   cat3k_caa-platform.SPA.03.03.03SE.pkg
16167  -rw-  77312832   cat3k_caa-wcm.SPA.10.1.130.0.pkg
16168  -rw-  1248       packages.conf
16169  -rw-  2097152    nvram_config
16170  -rw-  676        vlan.dat

1300365312 bytes available (287113216 bytes used)

switch: delete flash:nvram_config
Are you sure you want to delete "flash:nvram_config" (y/n)?y
File "flash:nvram_config" not deleted -- read only file system

switch:

[Leo Laohoo]

Let the switch boot naturally and then in enable mode, issue the command "wr erase" and this will factory default the appliance.

[paul dungey]

switch has booted up,

After powering up the cisco switch I'm faced with security banner and username to login,,

so pretty much in the same situation, is there a way to remove the flash files from read only to actually deleting them.

Thanks