I cant update packages, nor kernel

Yes, that issue and workaround was noted in the Stable Update 2023-11-06 announcement, in October last year:

Regarding the authentication issue; see if any the following notes from the respective Announcements might be relevant in your case:

I hope this helps. Cheers.

Aside:- These complications will arise as a result of not maintaining the system as frequently and thoroughly as a rolling release demands; this is unavoidable, I’m afraid.

If you foresee this situation arising consistently, it might be worth considering a point release distribution of some kind, instead.