[Q] Install ROM on Huawei G700 topic

I want to install a new, clean OS on my Android phone. My phone is a Huawei Ascend G700, the specs are here -> consumer.huawei.com/en/mobile-phones/tech-specs/g700-en.htm
Where can I find the ROM for this phone? The only ROM's I see are for the more "known" phones, like Nexus, or Samsung.
I would prefer to download the newest version of Android, KitKat or Lollipop. Now I have the 4.2.1 Android version.
If it is not possible to install the newest version, I want to download the clean version of 4.2.1. Does somebody know where to download this?

Thanks in advange!