Just released a new firmware update with some nice improvements:

• New console function "set correction <toggle>" to manually disable the CPS correction. As described on GitHub, the 4 faulty ADC channels are discarded, but in order to not falsify the CPS measurement, they are appended to channel 0 again. However, this often leads to the vertical scaling in Gamma MCA not fitting correctly to the overall spectrum. Therefore, the correction can now be deactivated. The 4 channels are ignored anyways, so you will read ever so slightly lower total cps if you enable this function. (does not apply to geiger mode)

• Lots of bug fixes in the settings. If something doesn't work right away, I can only recommend that you reset the settings once and reboot the device.
• Bug fix for the DC bias subtraction which could lead to an integer overflow.

Enjoy!