[Noam Daloya]

i have a nexus 4 and i by mistake download the 4.3 preview at some site and now it dosent open my Camera and not recognize
my sim card

[Aquila]

Do you have a backup you can flash back to?

If not you'll probably have to flash back to stock.

[Noam Daloya]

how

[Noam Daloya]

help Please

[digitalslacker]

i have a nexus 4 and i by mistake download the 4.3 preview at some site and now it dosent open my Camera and not recognize
my sim card

Hm to my knowledge there isn't a ROM out yet for the N4 running 4.3, I could be wrong about that but I've been watching and haven't seen it. You probably flashed the one for the HTC One.

Good news is that it's totally fixable

You have really two options

1) If you are good with losing the data on your phone (images, game play etc) then the easier route would be to restore using something like WUGs toolkit to get the phone back to 100% stock and then just re-root it and you'll be back to where you were before. You can also use this guide and restore it back to stock manually http://forums.androidcentral.com/nex...e-restore.html

2) if you'd like to try to just get the phone working again you should be able to flash over a 4.2.2 ROM. Something like this [ROM][OTA][mako]Android 4.2.2 JDQ39: Rooted Busybox Deodexed/Odexed (2/13/13) - xda-developers is going to basically be stock with all the working bits. I don't believe there's anything in 4.3 that'd prevent you from going back but it's still early...

hope that helps bump you in the right direction. drop any questions back in here and i'll try to answer them for you today.