I believe the only difference between U and C versions is the “bloatware” is from different telephone service providers…
Version “A” is exactly the same as “U” and “C” except without these Chinese carriers apps. :)
“A” still has those bloatwares under the directory "\custom\meizu\apk"
and which are unable to be removed (reappear after reboot) once you have installed the "A’ version or other versions that are not the international version, even you install/ flash back to international version, these bloatwares will still existing in the above directory and never remove if you installed non-international versions once