Bueno,
pues volvi a contactar con el servicio tecnico de Meizu contandoles que con la 4.5.5A sigue sin irme. (Ya les reporte el problema un par de veces hace un año con la kitkat, y al final abandoné...)
Ésto es lo que me contestan:
Dear Sir/Madam,
Thank you for writing to us.
We are deeply sorry for the inconvenience caused.
Please note that the A/U/C flyme firmware are Chinese version, the I version is the international version, they are not match and compatible, thus you can't change the firmware from A/U/C version to I version.
Please follow the following instructions to flash your device to the latest firmware to see whether it is solved.
1.Please back up your all data.
2.Please click"Settings-About Phone-Storage-Clean Phone data-Factory reset&Format SD card".
3.Download the firmware by your computer,the link is
http://download.meizu.com/Firmware/F...0ef/update.zip.
4.Please hold volume up for a while and then hold the power button until you see the Flyme logo when the device is off. Then you will see as below.
5.Connect your device to your computer.
6.You will see as below.
7.Copy the update.zip to the Recovery's root directory and then disconnect the device.
8.Choose start on your device and the update will start automatically after verifying the update.zip.
Is it OK?
Have a nice day.