No access to Advanced Settings, login fails

After several upgrades and downgrades I lost this access.
Is there some trick for that ? (without to reset all)

Opal v4.3.24

What is the error message you get?

I must say in addition that is not related to the upgrade to 4.3.24. My firmware was 4.3.19 then 4.3.21 then 4.7.2 beta then 4.3.19 then 4.3.24 with one reset but I don't remember when and it didn't fix this "no access" problem.
Do you mean in the logs ? I don't know and I can have a look at it.
All happens as if the valid credentials were not the last one I use, perhaps I could try the former ones.

Did you reset the settings while going to beta or back? This is highly recommended.

No, I mean "What happens when you try to login" - can you take a screenshot?

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I ve just tried to login from another Linux user account and I succeeded... so I don't know, perhaps I made mistakes in my password, or there is an explaination about the users... user banned ?

Could be caching issues. Try in incognito browser.

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Yes, it works like this but with a worrying point, that to delete the cache and restart Firefox, is useless. Only starting an incognito window (private session) works. How can that be explained ?

Firefox doing Firefox thingies.
Sometimes stuff is cached differently.

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I had a similar problem. I solved it by cleaning the following directories (valid for Chrome-based browsers):

...\User Data\Default\Cache\Cache_Data
...\User Data\Default\Code Cache
...\User Data\Default\File System
...\User Data\Default\Service Worker\

The folders are located along the browser installation path, or depending on which directory you chose during installation.