I'm trying to upgrade FWSM OS - within V3.1, the cisco doc says copy the image to flash, I didn't see where to setup the boot system file, do i need to? just like we do for PIX/ASA? if yes, what command is it? and what command does show the image file? Thanks.
FWSM can only take one image. It will wipe the previous one when it copies the new one when you issue the command copy tftp flash:image
So, there is no way you can save it or rename it. You may keep a copy of it in the disk: but the flash only can contain one image.
I would rather keep the older versions just in your tftp server just in case you need it. You can also download it online at cisco.com