Asus Zenfone Selfie Z00ud Firmware 6.0 1 -

No. ASUS never released official Nougat for the Snapdragon 615-based Z00UD. Unofficial custom ROMs exist (e.g., LineageOS 14.1), but they break some camera features.

Yes. The full firmware package (over 1.2GB) includes all partitions. No need for intermediate OTAs. asus zenfone selfie z00ud firmware 6.0 1

While ASUS partially disabled this feature on the Z00UD, the 6.0.1 firmware allows better SD card integration for media and app data. asus zenfone selfie z00ud firmware 6.0 1