How to properly downgrade recent upgrade of packages?

Looking for a proper terminal downgrade of recent package upgrade this past week.
Having problem starting phone after powered off. Some apps interfaces at times are not responsive also.

Also doesn’t restart using restart selection button.

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This is how I downgraded firefox-esr to the latest 102.* package:
(assumes you still have it in your package cache):

sudo dpkg -i /var/cache/apt/archives/firefox-esr_102.15.0esr-1~deb11u1_arm64.deb

I then ran this to prevent it from being upgraded:
(originally posted by @pajuky, modified by me into a shell snippet pastable via ssh)

sudo tee /etc/apt/preferences.d/60_pin_firefox_esr.pref << 'EOF'
Package: firefox-esr
Pin: version 102.*
Pin-Priority: 1000

I’m going to hold onto 102.* until someone takes the time to update the PureOS package firefox-esr-mobile-config so it works with the latest firefox-esr.

Not sure if you’re referring to firefox-esr or some other package(s). However, the technique should be roughly the same for any Debian package.