Firmware Version 1.0.2.0 incorporates the following fix:
Fixes a phenomenon in which the focal length may not change when the control ring’s function is to control the step zoom, and the control ring is turned slowly, click-by-click. (In AUTO, SCN, or Movie mode, the default function for the control ring is to control the step zoom.)

Please note that this phenomenon does not always occur with every affected product.

Firmware Version 1.0.2.0 is for cameras with firmware Version 1.0.1.0 or Version 1.0.0.0. If the camera's firmware is already Version 1.0.2.0, 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.

The new Firmware Version 1.0.2.0 can be downloaded by clicking here.

How to Identify Cameras eligible for the Firmware Update:
All PowerShot S100 Digital Compact Cameras are eligible for this firmware update.

This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.

Please register the PowerShot S100. By registering, we will be able to notify you via email when service updates are available.

Thank you,
Customer Support Operations
Canon U.S.A., Inc

Contact Information for Inquiries
Canon Customer Support Center
Phone:    1-800-OK-CANON
               1-800-652-2666
TDD:      1-866-251-3752
Email: carecenter@cits.canon.com
Support options and hours of operation: www.usa.canon.com/support