How do I update the firmware on my AC750 Range Extender?

Log in to the extender web interface and go to Firmware Update. Click the CHECK ONLINE button to check for new firmware automatically. If an update is available, follow the onscreen prompts to update (the process takes about two minutes). Alternatively, you can manually upload firmware by downloading it from the NETGEAR Download Center, clicking the BROWSE button on the Firmware Update page, selecting the .chk file, and clicking UPLOAD. Do not turn off the extender or go online during the update.