Edge 840 with fw 24.18 wifi seems it dosen't work?

I just received a new edge 840 non solar device 3 days ago, from the warranty, and it seems that the wifi is not working.

After I received the unit, I had to configure it and give it a map and software update, but the surprise. It sees my networks when I configure them, it shows that everything is ok, but when I let them synchronize, in over 90% of the cases it gives me the Sync Failed error...

I tried all possible combinations to configure the router as simply as possible to see if it works, but no improvement.

And the auto brightness on this version of the software is horrible. If I hadn't had another 840 before it, I would have said that's how they all are.