Firmware Version 1.1.0.0 incorporates the following enhancement:
Support for the new Electronic Viewfinder EVF-DC2 has been added.

How to Identify Cameras that are eligible for the Firmware Update:
Please check the serial number on the camera.
This firmware update is for cameras of which the sixth digit from the left in the serial number is “7”, “6”, “5”, “4”, “3”, “2”, “1” or “0”. 

Example serial numbers of eligible cameras [*****7******],[*****6******], [*****5******], [*****4******] , [*****3******],[*****2******], [*****1******], [*****0******]

Download Firmware Version 1.1.0.0 for the PowerShot G1 X Mark II.

If you have not already done so, please register your Canon Product. By registering, we will be able to notify you via email about future announcements.

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

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