Thanks for the response! For the kernel switch, is it using armbian-config to pick under my current installation? linux-image-vendor-rk35xx=25.2.3 v6.1.99 Is there anything else I need to do as well? Thanks!

Thank you SteeMan and Werner. I will try out your recommendations.

How to reset the armbian system and restore the initial configuration operation

... but at the same time, others with H3-based boards seem to have similarly high idle temps reported. @Domas Do you own one of those infrared themometers or have another way to ascertain the true temperature of your board? As the title of this thread says, I am curious about the accuracy of the onboard sensors. Maybe the sensors are even accurate but they need proper software calibration.

unsupported host os for build environment. Grant the user access to Docker or use a Noble host.