there is a brandnew firmware for the S2 - 1.0.0.24 in the owner area of Leica:
Description of Changes
1. Extending the memory card compatibility 64GB (UDMA6)
2. Lossless DNG Compression
3. Clipping Definition
4. Improvement in histogram for automatic picture preview
5. Extension of exposure time to 125s
6. Shutter speed pre-selection in BULB mode
7. Extension of setting options for AF/AE lock button
8. Optimization of AF performance – dynamic AF metering field width
Description of Changes
1. Extending the memory card compatibility 64GB (UDMA6)
2. Lossless DNG Compression
3. Clipping Definition
4. Improvement in histogram for automatic picture preview
5. Extension of exposure time to 125s
6. Shutter speed pre-selection in BULB mode
7. Extension of setting options for AF/AE lock button
8. Optimization of AF performance – dynamic AF metering field width