Once you've downloaded the firmware update, follow these steps to update your DIR853 ET A3 router:
These video guides provide step-by-step visual instructions for updating your DIR-853 firmware or switching to OpenWrt: dir853 et a3 firmware update link
To update the firmware for your DIR-853 ET A3: Once you've downloaded the firmware update, follow these
Always use an Ethernet cable ; updating via Wi-Fi can brick the router if the connection drops. Once you've downloaded the firmware update
Always use a between your computer and the router when updating. Do not use Wi-Fi, as a dropped connection during the process can cause a system failure. How do I update my device's firmware manually? | D-Link
Always verify you are downloading the "H/W Ver A3" file. Using a file meant for A1 or A2 will result in a failed update.