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So I just got a brand new CPE510(EU) v1.1, which will not - under any circumstances - connect to 3 older CPE510s v1.1 (one at a time in the simplest AP -> Client configuration) without the (EU) next to their name in both the sticker and the boxe's sticker description.

One thing i also found puzzling is apart from this one being sourced from Poland (the others from Germany) is that during initial setup I did not get to choose a region (neither is it evident in the wireless setup page) so I suppose it's the variant where this has been disabled in hardware since upgrading this to v.2.0.0 made no difference. Also the DFS selection is gone (using it on all others)..

Symptoms: Survey works fine, detects all the APs as one would expect, acquires channel of the AP but will not connect - it just stays there sending a few Tx frames every 5', receives nothing at all. SNR in all cases well above 30dBm so I doubt this is the culprit.

What do you suggest I do?