Official ROM v3.66 (UI3.6) (Android v5.1.1).

Very fast – smooth and stable Rom.

Update log:

[New] supports dual card switch, after work you can get the job card to switch off it!
[New] Support edge gesture, welcome experience!
[New] yellow bus service support functions, easy to buy a ticket, stay away!
[New] to support the new application center and browser, welcome experience!
[New] Niu support the new memory management and garbage clean-up feature that allows the phone more light!
[Optimization] optimized Niu applications since the launch control, and can save some more power it!
[Repair] repair some brands of SD card is not recognized, particularly thanks to actively provide us with clues leerein, childish Taoist, 0755 and honored to help other cowboy!
[Repair] amend banners remind "QQ running in the background," can not go away
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 v3.66 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 v3.66.

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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Please if you like my work Rate me with 5 Stars.

Thanks.