Huawei Ascend P1 U9200: upgrading (International to Chinese) I own a Huawei Ascend P1 smartphone (U9200, unlocked, international version, still original Android 4.0.3 factory build B003). During about a year that I have the phone, it started being much slower and I decided that it's time to upgrade the software. I have the following question:

Is it safe to try to upgrade an international P1 to more modern P1 firmware, but focused on Chinese market? The only official release available for my phone is Jelly Bean with EMUI 1.5, which is pretty old (B315, URL is available). I was hoping to upgrade, at least, to this Chinese release (B709): http://en.club.vmall.com/forum.php?mod=viewthread&amp;tid=15972&amp;extra=page%3D2. Also, it would be nice to read about any experiences, especially regarding feature set and stability, on the above, as well as (just in case) recommendations on restoring back official manufacturer's firmware for international models from Chinese firmware releases.

Your advice will be very much appreciated!
i just installed the official firmware.(B315, Jellybean) If you don't use the radio and MHL capabilities it is worth it, as those are not on there. Makes the phone faster, improves the camera. Battery icon shows exact percentage battery remaining making it at least feel if it last longer, still won't last the entire day if gaming on it. The volume up takes a photo and feels more responsive.