I'm using Fritzbox 7390. The firmware was 05.51. After updating to firmware 06.06, I found the WLAN speed was always capped under 60M/s (through speedtest.net). However, it was up to 90M/s before updating. I tried to plug in a LAN cable. The speed was 100M/s. The network was ok, but the WLAN was not.After google I found the message on AVM's website http://service.avm.de/support/en/SKB/FRITZ-Box-7390-int/231:Slow-wireless-connection-speed-for-connections-according-to-802-11n andhttp://service.avm.de/support/en/SKB/FRITZ-Box-7390-int/522:Error-message-quot-WLAN-transmission-quality-increased-by-reduced-channel-bandwidth-quotMy fritzbox log event did mention "Wireless LAN transmission quality increased by reduced channel bandwidth (2,4 GHz)." That's the problem I had never met when I was using firmware 05.51.I tried to follow AVM's instructions to solve the problem, but it did not work.It seems no way to downgrade the firmware to 05.51. The reduced WLAN speed really drives me crazy!!!
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