Leica released new firmware update version 22.214.171.124 for the M10 camera that corrects the issues when in certain cases black images were produced when using short exposure times:
With the previous firmware 126.96.36.199 a larger selection of SD cards were made compatible with the Leica
Unfortunately, we discovered, that in certain cases, the firmware 188.8.131.52 could produce black images when using short exposure times.
This bug has now been fixed with firmware 184.108.40.206. All improvements from previous firmware versions are included in firmware 220.127.116.11. We apologize for any inconveniences this may have caused.
Improvements of SD card compatibility
With the Firmware 18.104.22.168 a larger choice of SD cards is compatible with the Leica M10. With the last Firmware, certain SD cards were not recognized, or the complete write speed could not be used with the camera.
The Leica M10 supports SDHC/SDXC cards from 1GB up to 512 GB. We recommend to use cards with write speed 80 MB/s or higher in order not to restrict the cameras performance. In single cases it can Leica Camera AG / Seite 2 von 2 occur that the speed, stated by the cards manufacturers, differs from the effective read or write speed in the Leica M10. Use UHS I cards instead of UHS II. The M10 is compatible with UHS II cards, but does not use the full UHS II speed.
Leica performs ongoing compatibility tests of the latest cards available in the market. We ask for your understanding that due to changes in production and software, Leica cannot guarantee a 100% compatibility of the recommended cards.