- I assume you downloaded the newest firmware (version 1.21NA) from this site.
- Save or move it on your desktop so it's easier to find.
- Connect your router to your computer with an Ethernet cable.(If you're not sure what it looks like, see here.)
Do not upgrade the firmware over a wireless connection!
On the same page, look at the FAQ's. there is an entry called "How do I upgrade the firmware on my DGL-4100/DGL-4300/DGL-4500?" It is a description of the upgrade process itself and will walk you through the steps.
I'm just amazed that they miss a really important warning. Do not unplug your router or close the browser on your computer until this process is finished. This can render your router useless and you will have a nice, expensive doorstop.
When the upgrade process starts, go have a coffee, do your dishes, whatever, but:
Leave the router and your computer alone! Wait until the router's reboot is completely finished.
If you have any more questions, just come back here and leave a comment - I'm happy to help.
While updating your routers is a good idea for fixes with manufacturer bugs, an update may or may not solve your connection issues.
A little more information about your particular issues would help a lot.
Also, you may find firmware updates at d-links website, as well as a great walkthrough to help you through the whole process. They also have a toll free support number available.
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