Edit in /boot/armbianEnv.txt has no effect

[onestone]

I have just downloaded desktop Armbian 22.08  Jammy XFCE on my Odroid-C2 and it works fine on a 1080p monitor. I need it to work on a different monitor though so I have added the following lines to /boot/armbianEnv.txt

display_autodetect=false
hdmimode=1680x1050p60hz

and added
hdmitx=forcergb
in the bootargs (which I copy/pasted from /boot/boot.cmd)

but it has no effect. My monitor works with these parameters on Hardkernels Ubuntu 18.04 image. What else do I need to do? 

[Myron]

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.