I just want to know why my RB751U-2Hnd I Upgrade from package 5.17 to 5.25 and after reboot my wifi stop working. Before the upgrade I backup my config and after i upgrade a restore my backup config to leave everything the way it was but rearly my wifi stop working. So i went to Winbox under quick set and the wireless protocol option was on NV2 option instead of 802.11. I does not supoused that my config was on 802.11? maybe it is an issue with the upgrade for this model?