Hello dear polish router hacking community. I searched my ass off to find more info on the most recent 904xdsl builds from chomikuj.pl, and this is where google finally did send me to. Thanks to google translate I could read trough the whole tread - so many things became suddenly clear! (Like: You could do THIS to fix xyz, but don´t touch THIS or things will break.. yes, this is INDEED what happens, as I had to find out..do not touch inic..) Anyhow, I really want to thank you for the great work. Maybe you could translate some of this, so its easier to find? I believe many people would appreciate this. I am using the newest 5.4.77 VPE now, it runs much better than the older versions.  But is there a reason you made no SMP release of it? No question, what you delivered turns this 5€ router into a scary monster, but I really wish there was a "clean" stable version SMP version, without anything preinstalled, so I can build it up myself and learn.

Anyhow, enough requesting now, here is something I found out by hammering stupid  tongue-tied iwpriv with commands I found on the web. I don´t know if this any news to you, but it allows to set 2.4 ghz to 40 Mhz bandwidth and 5 Ghz up channel 144:

iwpriv 'wl000' set Enable=0;iwpriv 'wl000' set RadioOn=0;
iwpriv 'wl010' set Enable=0;iwpriv 'wl010' set RadioOn=0;
sleep 1
iwpriv 'wl000' set HtBw=1
iwpriv 'wl010' set HtBw=1
sleep 1
iwpriv 'wl000' set TxPower=20
iwpriv 'wl010' set TxPower=20
sleep 1
iwpriv 'wl000' set Channel=108
iwpriv 'wl000' set HtMcs=33
sleep 1
iwpriv 'wl000' set HtTxStream=3
iwpriv 'wl010' set HtTxStream=3
sleep 1
iwpriv 'wl000' set AP2040Rescan=1
iwpriv 'wl010' set AP2040Rescan=1
sleep 2
iwpriv 'wl000' set TxPower=100
iwpriv 'wl010' set TxPower=100
sleep 2
iwpriv 'wl000' set Enable=1; iwpriv 'wl000' set RadioOn=1
iwpriv 'wl010' set Enable=1; iwpriv 'wl010' set RadioOn=1

I believe some is not needed, but it works for me.

edit: removed polish translation. Just wanted to be polite and not jump into a native speakers place
shouting english.

& this:  https://my.mail.de/dl/af8b0277192110d19c78b4f3f0778876
(regulatory.db -- world to 30 dbm --- some startup wifi settings. hope it works..)

In general: Please keep in mind that the stuff i postet is the result of a not even an half-educated guess,
but simple trial and error. And was originally posted at 4 in the morning. ;-)