From Canon USA:
Details:
Firmware Version 1.2.4 incorporates the following improvements and fixes:
Note: *This phenomenon occurs only with firmware Ver. 1.2.1. After changing the GPS device settings, please be sure to power off the camera before removing the battery. This will ensure that the camera's GPS device settings will be saved.
Firmware Version 1.2.4 is for cameras with firmware version 1.2.1 or earlier. If your camera’s firmware is already Version 1.2.4, it is not necessary to update the firmware. When updating your camera’s firmware, please review the instructions thoroughly before you update the firmware.
The firmware update takes approximately seven minutes.
Download:
The new Firmware Version 1.2.4 can be downloaded by clicking here.
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.
B&H carries the Canon 1D X DSLR Camera. The Canon Store also has the Refurbished 1D X in stock.