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&tid=15972&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!