[Q] Can't boot my android after changing permissions topic

I recently rooted my android (Nexus 4). I wanted to make /system folder permissions 777, I needed that for another application. I got Root Explorer application, and changed permissions to 777. Then root folder disappeared and hanged up. I tried to restart my phone, but now it doesn't even boot up. What should I do? ... Please, don't tell me I bricked my phone.. It was just permissions, nothing more... I have no idea how to recover now.

When I do

Code:

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adb shell

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in my PC console, I also get mesaage:

Code:

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/system/bin/sh: /system/etc/mkshrc[9]: getprop: can't execute: Permission denied

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Also I can't go to root mode (adb root) in console, from $ to #.. so it means.. I even can't change permissions anymore?