Not updating the rss 500px

Hello all ;-)
I have a problem updating the rss 500px since July, it does not update it!

Do you have the same problem?

If so what would be the new address (wg) for the feed please, because I found an address but it does not correspond at all to the flow of the web page.
thank you very much for your return. :-)

Just for reference for anyone that runs across this post.

The rss feed is back up, but they turned the image quality down.