[Zuk Z1 Q&A, Help & Troubleshooting] ducnv:
Hi All,

I have bought about 20 Z1 devices from my company (customers returned and Service Dept. cannot fix them)

I open all of them (LCD, Battery, Mainboard) then play LEGO game :)

After that, half of them can work :) Only some have problem like:

- SIM not work

- WiFi not work

- Fingerprint not work

- Home not work

- LCD have some yellow area

After working with them and having a look at all topics in this sub, I make a note about some common ZUK Z1 bugs that may help anyone have same issue with me

1. Battery issue

- Phone work normally but sometimes auto reboot

- Phone show incorrect % battery

It's time to think about replacing a new one, I have bought from China with about 7$ (including ship fee to Vietnam)

You can buy battery like origin or D.Seven name like me

2. Fingerprint/Home key

- If home key cannot work then your key may be dead

- If home key still work, only fingerprint not work, update below file via TWRP (I already test on 7.x, with stock ROM, I have finger, but update to Nuclear 7.x, it dissapeared then I update 7x below file and it's OK)

-- Android 6.x: https://www.androidfilehost.com/?fid=24533103863141329 (https://xdaforums.com/zuk-z1/development/mod-restored-fingerprint-touch-t3262388)

-- Android 7.x: https://www.androidfilehost.com/?fid=745425885120705241 (https://xdaforums.com/zuk-z1/help/fingerprint-menu-disappeared-t3411565)

3. WiFi/Bluetooth

If you cannot turn on WiFi/Bluetooth (WiFi MAC address starts with 02:00:00:00:00:00) then they can be dead

I've read a topic about this but I forgot link :(

4. Bootloop

- I have 2 devices with bootloop issue

- I use QFIL to flash China ROM then it can pass bootloop (https://www.androidfilehost.com/?fid=24052804347826528)

- Dev. option of this ROM does not have Update Cyanogen recovery option so I cannot flash TWRP via flash then I use QFIL to flash

- After that I can flash cm-13.0-20160416-NIGHTLY-ham.zip (6.x) but flash CM14 or higher will have bootloop issue again

- You can follow this link to download flash tool, driver, guide changing Chinese language to English,... http://www.tech-and-dev.com/2016/06...ing-to-marshmallow-zui-lenovo-zuk-z1.html?m=1

Update:

- Both above device can update to 7 with ZUI 2.5 https://www.androidfilehost.com/?fid=457095661767156988

- One of them can flash NucleaRom-V2.1.5-OFFICIAL[7.1.2]-ham-20170716-2114 https://www.androidfilehost.com/?fid=889764386195916500 (this is one of the best ROM that I've known

5. Flash NucleaROM 7x, lost accelerometer and fingerprint (use stock ROM, both sensors work normally but update to NucleaROM 7.x will lost both of them)

Up to 6.x then 7.x

Another case

- Flash China ROM first by QFIL: https://www.androidfilehost.com/?fid=24052804347826528

- Flash TWRP

- Flash ZUI 2.5 by TWRP: https://www.androidfilehost.com/?fid=457095661767156988

- Flash NucleaROM 7.x (lastest is 2.1.9 https://androidfilehost.com/?fid=961840155545588772)

6. FRP pass (Require last Google account after reset/flash)

Too many steps but can pass (if you cannot turn dev. options, you can pass this step)

https://m.youtube.com/watch?v=3tMoleAMkoU&t=182s

I still have issues that need to find. Pls help if you already in that case :)

Not detect SIM (I also heard this issue on XDA)

Update: One device can detect SIM2 after flash 7.1.2 but after few hour it cannot??? so strange)

Cannot flash CM14 or higher ROM with some devices

Update: 1/2 devices with bootloop can flash higher ROM by flash ZUI 2.5 first

Useful links:

- Stock ROM flash by QFIL (Lenovo ZUK Z1 team send to Vietnam for testing and I'm responsible for this task): https://drive.google.com/open?id=0B6VA9wVCZsgXWnZmYVN6c3RHWXM

- Lenovo Zuk Z1 ROMs, Kernels, Tools, Guides: https://xdaforums.com/zuk-z1/general/index-lenovo-zuk-z1-t3384098

- Android Device Partitions and Basic Working: https://xdaforums.com/android/general/info-android-device-partitions-basic-t3586565

- ALL IN ONE tool (Drivers|Unlock|TWRP|Factory Image|Stock Recovery) Win/Linux: https://xdaforums.com/zuk-z1/orig-development/tool-toolzukz1eng0-0-3-mauronofrio-t3332563

Some images about my work :D

[IMG="Z1 devices"]https://scontent.fhan3-1.fna.fbcdn.net/v/t1.0-9/20479890_10210019593790631_4268166491004955109_n.jpg?oh=5edcb4631d7bafd194900b609e940cd0&oe=5A2A5CAE[/IMG]

[IMG="LEGO game"]https://scontent.fhan3-1.fna.fbcdn.net/v/t1.0-9/21192567_10210248721278675_7760591638279536411_n.jpg?oh=17d15eb40182fc9f03d258829c9571eb&oe=5A279572[/IMG]

[IMG="Battery"]https://scontent.fhan3-1.fna.fbcdn.net/v/t1.0-9/21192266_10210248720518656_2993493720260120132_n.jpg?oh=c195b99d23f77744170e48b20be8b1cc&oe=5A607DA5[/IMG]