Unknown Error 109 during firmware update for R6900 router

[Kell_Cannon]

I am trying to update the firmware for R6900 but keep getting "unknown error 109" after clicking "yes" to upgrade. 

Current GUI Language Version:	1.0.2.6_2.1.38.1
New GUI Language Version:	1.0.2.8_2.1.38.1
Current Firmware Version	1.0.2.6
New Firmware Version	1.0.2.16_10.0.42

I downloaded firmware version 1.0.2.16 to computer but don't know how to manually update the router.

The app also doesn't work for upgrading firmware.

[plemans]

I'd highly recommend not updating via the app. 

How do I manually update the firmware on my NETGEAR router? | Answer | NETGEAR Support