Mobile devices can't connect to internet

[ChristianOlloz]

After I changed my router to a new one, my mobile phones won't connet to the internet. Says No internet connection.

My PC's are connecting without problems.

The mobile phones connect fine to my EX7000 WiFi Extender.

I tried resetting the EX7000 to factory default and did a new setup.

I tried rebooting both router and extender.

I tried forget network on the phones and tried resetting network settings on mobiles.

I have latest firmware V1.0.1.78_1.0.140

[ChristianOlloz]

I fixed the problem.

I downloaded an old firmware, and then it worked.