Is it possible to check the integrity of discontinued OS files?

[CCC3]

This situation requires reinstallation of discontinued PI 2.2 version equipment.

The OS file has been obtained, but the integrity of the file needs to be verified (checksum) before reinstallation.

I know about certutil in windows, but
There is no cisco value to compare to this value.

Please advise.

(I am fully aware that the version is low.)

[Mark Elsen]

 - What is the 'use case' for getting ancient and unsupported software to work (?) ; if you value business then use modern and supported software , 

 M.