Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

PIX 520 failed more boot

Dear ALL,

I have an old PIX 520 with these details :

Version 5.1 (4)

Finesse Bios V3.3

Hardware: AL440LX, 32 MB RAM, CPU Pentium II 266 Mhz

BIOS Flash AM28F256

Licensed Features:

Failover: Enabled

VPN-DES Enabled

VPN-3DES Disabled

Serial Number xxxxxxxx

Activation Key yyyyyyyy

I tried a sw upgrade to 6.2 version, but after installing new software PIX wasn't able to boot anymore.

So, I inserted floppy containing 4.3.2 version (when was shipped) but PIX still is not able to boot, and I get an error

like "Not Authorized To Run On This Hardware!"

Why? Since PIX was shipped, no one has changed authorization key so why seem to be not valid ?

What can I do to still use that PIX ?

Regards Alberto Brivio

New Member

Re: PIX 520 failed more boot

Hi Alberto,

For version 6.x about flash memory:

Some PIX 520 units may need a memory upgrade because older units had 2 MB, though newer units have 16 MB.

It may also require a new 3des-key:



New Member

Re: PIX 520 failed more boot


I need some information in order to reactivate pix:

I own PIX 520, and activation key for 5.1(4) supplied by ISP, but I have 4.3 software without activation key.

So, I'd like to know how can I buy 4.3 activation key and 5.1(4) binary file.


Alberto Brivio

New Member

Re: PIX 520 failed more boot

New Member

Re: PIX 520 failed more boot

for software download use this URL (CCO required)