Maybe because of fossil signatures, unable to download anything on FP1 in 2024

Hello,
While we have a range of Fairphones 3 in the family, I just recuperated an original Fairphone 1, of which I even had forgotten the unlocking.
I then decided to reset it entirely, as described here, and am now facing a brand new system, but I find myself unable to download anything, and even, most of the webpages I reach do not load as https doesn’t work.

Is there a way to get out of this?

I believe what I ned is some sort of F-Droid apk, from which I’d download everything I need.
Any advice to a supporter from day 1?

TIA!
Hervé

make sure the device’s clock is synchronised with an internet server in the phone settings, because the device knowing the exact time and date is necessary for establishing HTTPS connection.

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Do you have any specific use case in mind that you want to do with the FP1?

I mean, I guess you don’t intend to have someone use the FP1 as their main phone. But if you do I’d say it’s not worth the effort.

But if it’s just a single, simple thing or two you want to do with the FP1 it might help to describe that.

For browsing web pages, Firefox could help as it usually comes with its own set of certificates instead of the system ones. But I’m not sure if it’s the same on mobile.