I waited for the new flyme regarding all the android security problems. And it comes yesterday. The download and install were ok and start perfectly to the new 5.1.5 version.
Then problems  : one of my app open and then shutdown immediatly and so a second one.
I decided to uninstall one and to reinstall from playstore....and i had error RH-01 . I cleared the cache etc from appstore . The prob was still here, so is decided to delete my google account and resintall it. And impossible to contact google servers. Great. only solution from now. A factory reset .
And suprise the flyme account was not here anymore, and no possibility to root the device as on the previous version.
And my mx4 is not recognize as usb by my win7 ., Well well ..it's a mess


that's all ;)