RebornOS currently has 34 mirrors available from its repository.
There are two repositories that no longer work: repo.rebornos.org and repo-de.rebornos.org.
If your RebornOS installation has problems trying to update the RebornOS repository, it is very possible that you have these two active repositories in your reborn-mirrorlist file.
The process to update this file is explained in our Wiki, in the following article.
The RebornOS Team