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Corrects the dose rate: the default tube sensitivity is now 180 counts per minute for 1 µSv/h (it was 80, which showed about 2.2 times too much). Natural background now reads around 0.1 to 0.2 µSv/h, in line with the factory firmware.
Update: hold OK, press power, plug in USB, copy the file of your language onto the drive that appears (docs/install.md). A sensitivity you saved yourself in the calibration screen is kept; if you never changed it, set it to 180 once (Menu, Calibration) or run the calibration wizard.
Files: one .bin per language, checksums in SHA256SUMS.