I've just built a production network using RouterBoard 2011UAS 5 days ago. I thought to upgrade the system since there's an available update.

The update is 6.37.1

The problem is that I lost wireless interface completely.

Please explain for a newbie with this system how do I fix this.

PS. I have a system backup with wireless working, but restoring isn't a solution.i need to take in the update.

I had the same thing but on a 750.

Solution:

Downgrade to previous version. Download it from the web, put the files in the files section and downgrade (reboot). Everything will be restored.