Hi Ron,
There is a compact flash slot on the front of the management modules. Here are 3 options from HP:
256MB Compact Flash Card - JC686A
512MB Compact Flash Card - JC685A
1GB Compack Flash Card - JC684A
Once you install a compact flash into the management modules, it becomes another storage option in addition to the internal flash.
Directory of Internal flash: "dir flash:/"
Directory of compact flash: "dir cfa0:/"
You would want a compact flash in every management module and then copy the software to it (cfa0) and then reference the new location with the boot-loader command. While support may push back a little if you use non-HP compact flash, I am not aware of any issues with using generic compact flash. But if you go bigger than 1GB, the switch may not recognize it.
Cheers,
Eric