Firmware update IKEA N2 remote does not conclude


I got multiple Remote Control N2 von IKEA of Sweden.

All of them got updated from 0x02040005 to 0x02040011.

Some of them are the older type, some of them the newer. For each variant the update worked.

Some only after I changed their pretty poor battery to new ones.

But one is just not getting it.

I can manually trigger the update. If I awake the remote by pressing a button it always starts properly to update. I see the % ramping up (highest I ever saw was 78%) but in the end it fails.

Tried ~10 times now.

Any ideas on how to get this done? Battery is new.

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