I want the keychain password in order to make update software

• If you need to update your keychain password on Mac - Apple Support

• If your Mac keeps asking for your keychain password - Apple Support

• If you can't reset your Mac login password - Apple Support

https://support.apple.com/en-us/HT212190

• If you forgot your Mac login password - Apple Support *

https://support.apple.com/en-us/HT202860

* "These steps are for macOS Catalina or later. The steps for macOS Mojave or earlier 

are different. If you're not sure which macOS you're using, try these steps first."

..Narcos_s..

Uncertain how to resolve present issue with your kit, however

more information on Keychain and certificates; among others

are in this User-guide, with Keychain's Table of Contents.

• Keychain Access User Guide for Mac [Table of Contents] - Apple Support

//support.apple.com/guide/keychain-access/toc

They may be of some usefulness, at some point. When there's

a keychain issue, at some time; you'd have to reset different

items associated in there, in order to proceed. Read details.

.Note there are 'troubleshooting extras' beneath ^ above listed entirety.

Another item that may be a stretch, follows: could be useful to understand:

• What is Keychain Access on Mac? - Apple Support (incl. high sierra to monterey12)

//support.apple.com/guide/keychain-access/what-is-keychain-access-kyca1083/10.0/mac/10.13

Sorry to not be of much help, but as 'Volunteers' most of us have

lots of stuff to do, away from online internet & discussion boards.

[Maybe of help to try offer reply to BDA's question, it's left hanging!]

Which exact Mac do you have?

Apple logo at top left>About this Mac...