[Biep]

Since October or so the update feature in KOReader (on Kobo Aura One with KSM) no longer works for me. Whenever I try to update, I get "Update information unavailable on XX channel" (or rather the Dutch equivalent of that). I just dumped the latest version of KOReader in .adds/KOReader, but the problem persists.
Any ideas how to solve that?

Thanks a lot in advance, and thanks for a wonderful reader!

I can't post a reply, so let me try here:

Before updating manually, no channel/server combination worked - trying from many different WiFi hotspots. Nickel updated without problems.
After manually updating I had tried both channels, but only the vislab server, which didn't work.
Both links you give are intermittently accessible - sometimes I get there; sometimes I get "server not found". (You call them 'mirror', but the visual lay-out is not the same, BTW.)
With ota.koreader.rocks I got somewhere - the update was consistently offered, but then failed, with first a three-way option (retry, delete temporal files, keep temporal files), and upon retrying a two-way offer (keep or delete temporal files).
With koreader.ak-team.com I finally was able to update - though it took a > 15 min zsync delta computation.

Thanks!

P.S.: Almost 100% of the attempts lead to a "torn screen", a triangular white area, often covering the pop-up window with the failure message/update offer.