It's easy to update the firmware on your Sigma lens. Just follow these simple steps:
1. Download the latest firmware for your lens model from the Sigma website.
2. Extract the downloaded file and copy it to the root directory of a blank, FAT32-formatted SD card.
3. Insert the SD card into your camera, then turn on the camera and enter its menu system.
4. Locate and select the Firmware Update option, then follow the prompts to complete the process.