Hi again. I got it working again by connecting directly and uploading firmware by using this guide: https://community.tp-link.com/en/business/forum/topic/263906. Now it works with the newest version...

I had the same experience just now. No system light. But I could get a throughput to a directly attached pc to and from the modem, but it was like there was no router in between. Fortunaly I have a...