Zend certified PHP/Magento developer

Magento 2.4.2 to 2.4.3-p1 error after upgrade

I’m new on the forum.
Recently I tried to upgrade my Magento from 2.4.2 to 2.4.3-p1. It didn’t work.

I normally do both code and bd backups before and after any major change or module installation.

Now I want to reverse my Magento to the previous stage using one of my backups but for some reason, I can’t do it.

I can’t disable the maintenance mode to clear cache and so on.
I’mconcedering putting a new Magento 2.4.3-p1 from scratch but I need some data from this broken one. Especially product data.

Can somebody help, please? I have 10s of backups in my /var/backups directory. How can I use them to make my Magento work again?

Thank you in advance.

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