https://www.instructables.com/Custom-Firmware-for-Chinese-Radiation-MeterGeiger-/
Custom Firmware for the FS2011/YT203B Geiger Counter : 7 Steps (with Pictures) - Instructables
Custom Firmware for the FS2011/YT203B Geiger Counter: I recently got an FS2011 radiation meter/Geiger counter, whose hardware is actually quite good, but has...