Official ROM v3.70 (UI3.7) (Android v5.1.1).

Very fast – smooth and stable Rom.

Update log:

[New] from inquiry Weather feature, small partners around the country, the weather today.
[Optimization] calls to remind show the company posts information to help you recall business partners!
[Optimization] the second element layout information when the vertical screen to hide, let the content once see your fill!
[Optimization] animation performance were a key clean-up time in the application, make the operation more intuitive.
[Optimization] system performance, including contacts, messages, music and other system applications, operating more fun!
[Repair] multi-task management locking angle standard loss.
Optimization includes but is not limited to the above items listed.

Install:

1)Enter to Stock Recovery OR to TWRP Recovery v2.8.7.0.

2)Make full wipes. Wipe—> Advanced Wipe—> (Dalvik Cache – System – Data – Cache)

3)Install Stock v3.70 update.zip.

*Before installing this rom you should have preinstalled v3.22 with nubia tool.

*If have preinstalled cm12 need to flash official 3.22 with nubia tool and after install this rom v3.70.

Stock v3.22 here:http://www.needrom.com/download/nubia-z7-max-v3-22/

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Install Drivers & Recovery:

1)Download (My Tool http://www.needrom.com/download/z7-max-all-in-one-tool-v1-1-0/ ) UnRAR and run it on your PC.
2)Press 1 to Install The USB Drivers
3)Turn On USB Debugging Mode To Your Phone.(How to: https://www.youtube.com/watch?v=ze7y8rPzH9w )
4)Connect your mobile (mobile to be active) to the computer and select number.
5)DONE.

—-WARNING:This Tool Works Only For Android v5 and v5.1.1 Lollipop—-

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Root:

1)Download SuperSU-v2.52.zip and put it to your internal storage.
2)Enter to TWRP recovery and install SuperSU-v2.52.zip.
3)DONE.

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Install Google Apps:

1)Download Gapps For Android v5.1.1 Nano 29-11-2015.zip. and put it to your internal storage.
2)Enter to TWRP recovery and install Gapps For Android v5.1.1 Nano 29-11-2015.zip.
3)DONE.

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How to restore IMEI and MEID tutorial:

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Official source:

http://bbs.nubia.cn/thread-566422-1-1.html

http://ui.nubia.cn/rom/detail/9

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Thanks.