This firmware resolves the phenomenon where the AE flickers when shooting movies of a subject with brightness level that sets the ISO speed between ISO200 and ISO400.
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Changes:
Firmware version 1.0.1.0 incorporates the following fixes and improvements.
Resolved the phenomenon where the AE flickers when shooting movies of a subject with brightness level that sets the ISO speed to between ISO200 and ISO400.
This phenomenon only occurs in Standard mode (in Full HD image quality) and Super Slow Motion Movie mode (240 fps / 120 fps). It does not occur in other movie modes or still image shooting.
Firmware version 1.0.1.0 is for cameras with firmware up to version 1.0.0.0. If the camera's firmware is already version 1.0.1.0, it is not necessary to update the firmware.
Please note that, once the camera is updated to the latest version, it cannot be restored to a previous version.
How to Identify Cameras eligible for the Firmware Update:
Please check the serial number at the bottom of the camera. This firmware update is for products with the following serial numbers.
Products with "0" in the sixth digit from the left (* * * * * 0 * * * * * *)
Among the products with "0" listed in the sixth digit from the left in the serial number, the ones with a black marking inside the battery cover already have the updated firmware, so this update does not apply to these products. These products can be used as is.
Further information:
Click here to get the latest firmware for PowerShot S100. 
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