mobile

I have Android 4.2 installed on my Galaxy S4. Since I rooted my phone as soon as I got it, I never got any OTA updates beyond that. But now I hear that Android 5.0 (Lollipop) is out for my device, and I want to install it. But all I can find are custom ROMs, and I don't want to install one of those as then I'll have to do a factory reset, which I just did a few weeks ago and I'd rather not have to do all the setup again.

Can someone please point me to where I can find the stock ROM update downloads? I'd like to keep root access after flashing, so let me know if there's anything special I have to do for that.

Thank you!