Hy Ondra,
Thank you for you support.
I bought my phone in a China Mobile shop and you will find below his caracteristic:
- Baseband version: I9508ZMUHNH6
- Build number: KOT49H.I9508ZMUHNH6 2014-08-27
- Kernel version: 3.4.0-2632060 / dpi@SWDD5516 #1 / Wed Aug 27 21:05:18 KST 2014
But if you can't find the issue, it doesn't matter, I'm not sure that Chinese people use this software
(Because they are using a chinese store, not this one from Google)
But on my phone, I have installed the Play Store from Google, I'm French but I work in China...
Anyway, thanks for your support!!
JB