And yes, sorry, I had already restarted everything several times.

@David-TP THX, David, for the swift return. I understand that 240 MHz is not yet available for me as I have European models on Hardware V1 and I have not seen the corresponding firmware. Maybe you...

When channel selection became available, I changed my 5GHz band manually to channel 100 as I had another access point that was not correctly recognised in the automatic optimization scan. Now, I do...