I recently purchased a Cisco Pix 520 firewall for a test lab. The current version of IOS software is 4.4(1) and I want to upgrade to 6.3 version or latest. I downloaded the files pix635.bin and bh61.bin to upgrade, via diskette, but it doesn't seem to work. Any suggestion? Is the upgrade possible? Thanks
Scott
No. It is not possible to get a new support contract or to relicense a PIX 520, so it is not legal to use the software at all, let alone upgrade that far.
(Exceptions: certain EU countries; or if you literally bought the entire company that previously owned the unit.)
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