yashsingh1/xdaforums huggingface dataset:
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
I guess that you cannot resolve the "blue-screen issue" without the QFIL method, which is required if the boot-loader of your device is too old, as it was mine.

I have already briefly reported how I did, but I will try to do it again in a more detailed form.

You need a Windows PC and Qualcomm QPST, read this carefully: https://zukfans.eu/community/threads/howto-flash-a-stock-zui-rom-zuk-z2-z2131-only.104/

You need a ZUI QPST archive above version 3.1 as reccomended by the OP, I used this: ZUI 3.5.389 https://drive.google.com/open?id=1xWGFtcMZhMeOAsmASj4fwJzzbHOZZwdj

I failed to use the method 1:

using the command "adb reboot edl" (my device was just shutting-down and never enter into EDL mode as requested by QFIL.

I used successfully the method 2: using Volume+ and Power buttons:

1. disconnect USB cable and turn the phone completely off

2. press volume-up, and keep it pressed until further notice

3. press power button, keep it pressed for about 1/2 a second (yeah, that timing thing...)

4. insert usb cable (both volume-up and power still pressed at this point)

5. wait for short vibration - you should also see the ZUK logo flash on screen for a split second

6. now you can release both power and volume-up, you should already see the USB device coming up on PC

If anything different happens, just disconnect, power-off and start again... Have fun!

When you finish the flashing of the ZUI QPST ROM, you should reboot and set the

4G to extended capabilities

, in case you have VoLTE on your area.

Then you need to verify if your boot-loader is still unlocked (as mine was) in case it being locked you must proceed to unlock it again as you did the first time.

Then you have to flash the recovery.img (I used TWRP).

Finally you have to flash the TWRP with Treble support (z2_plus_treble-TWRP-3.2.2_kubersharma_v2.img) and factory_to_vendor.zip (factory2vendor_z2_plus.zip).

If all the above end up correctly, you can proceed to flashing AEX 6.0 official and Gapps*

* Note: I used older version of nano Gapps arm64 android 9 (open_gapps-arm64-9.0-nano-20181009.zip) because the newer release was not allowing to restore my Google backup.

Hope you could get some help with my description!

Regards,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] samartht:
I appreciate your help but the only thing is I can't get my hand on a PC right now , so just wanted to know if there's another way , anyways thx for your help maybe it will help someone else who does own a PC and facing similar issues

Peace :svetius:
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] froglk:
Installed ZUI 3.5.389 via QFIL and then AEX6, great ROM. Some issues:

- no left swipe settings

- camera app could not run from lockscreen

- it would be nice to add settings to disable led when usb plugged in

- keepas2android app does not work, I guess it is app problem not ROM.

anyway great ROM, hopefully the bugs will be fixed

Also QC3 charger working properly with this ROM, does not turn on quck charge mode.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Etienne Navarre:
is there a way to update bootloader version without flashing ZUI?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Gauravism:
Use decrypt twrp

flash zui3.5 twrp rom (for Z2_plus)

boot and flash the zip below.

Bootloader will be updated.

https://drive.google.com/file/d/1-pDsLJ1JO-yyZAGJn8NEka9Piu7575OC/view?usp=drivesdk

I'm not so sure about this. If someone could try please share if you're successful.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] DrasticHarm:
This method worked for me.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] samartht:
What excatly are we supposed to do and where did you get that file ?

Could you let us know ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] abhi.goel:
can someone post the benchmark scores of latest rom ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] DrasticHarm:
I have downloaded this pixelexperience zip: PixelExperience_z2_plus-9.0-20181024-2248-OFFICIAL.zip

And extracted boot.zip from that zip.

Renamed boot.zip to boot.img and flashed it to the boot partition woth twrp.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] samartht:
Okay I don't see how that solves the new firmware problem but great that you got it working
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
Basically he changed kernel ...
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
I suppose it works because you already had the right boot-loader environment as requested by AEX 6.0 official 4.4 Kernel..

If you rely on older boot-loader I bet your attempt fails.

Regards,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] saadkhan955:
How to check bootloader version
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Nonononoki:
Benchmark results:

Geekbench 4 Single-Core Score: 1821

Geekbench 4 Multi-Core Score: 4177

Antutu Score: 164051

Antutu CPU Score: 52960

Antutu GPU Score: 65832

Antutu UX Score: 41167

Antutu MEM Score: 4092 (kinda low? Says I defeated only 11% of all users)
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] frozenfirevr:
Is there any way to increase the saturation? The display as it stands is extremely washed out and is just sad. Almost makes me cry everytime I look at it. :P It was perfect on 5.8. Other than that, feels pretty good till now.

EDIT: I skipped root this time... Adblocking didn't feel like it was worth it, especially since it was breaking stuff.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Chenrylee:
Screen touch doesn't work during first boot (setup wizard).

1. During the first boot, I cannot tap the language selection button;

2. After tapping for times, it says entering QR scan, and asks me to connect to WiFi;

3. If I want to tap the SSID in the center of screen, I have to tap the bottom border of screen, it's impossible to tap where I want.

Anyone met same issues?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
I saw an option in settings which I suppose serves to adjust the screen colors, brightness, etc. But I don't remember the name nor I have tried it.

I agree with you about the "more washed tints" on this ROM.

Cheers,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Gauravism:
Can you confirm if your YouTube video palyback works ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] frozenfirevr:
I didn't find any such setting. Will take another look. Please let me know if you do.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
It is in

Setting-system- zuk extras-color manager
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
Yeah! It is into Settings>system->advanced->Zuk Extra->Display Color. There is KCAL as adjustment manager. It works, I have not changed my default setting though.

Regards,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] frozenfirevr:
YAY!!! Thanks a ton :D *dances*

Saturation at 270 looks good... Could probably be a little lower, but sweet... Thanks again.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] LAKSHMI SAINATH:
Does anyone facing charging issue....???

It started aching me from last 2 hours nt able to charge my phone...

Latest update worked perfectly until noon after that im facing charging error can't able to charge...

Just wanted to make sure whether problem is with my charging port r any rom issue....???
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] DrasticHarm:
Yep, works
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
Just reboot and try again it will work
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] DrasticHarm:
At least Wifi was not working for me in my first attempt:

- wipe system, cache & dalvik

- flash Zui Rom

- failed to boot Zui (via TWRP)

- Tried to be lucky and:

- wipe system, cache & dalvik

- flash AOSP 6.0 official + gapps + magisk

After I flashed the new boot.img and reflashed the ROM and other stuff, Wifi is working.

Not sure if is because of the boot.img.

I don't know enough about the architecture to be sure.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] LAKSHMI SAINATH:
I done everything rebooting and dirty flashing rom again....

Let me see if it works after complete drain...

If not maybe my charging port issue...:rolleyes::rolleyes:
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
It is know bug in 4.4 kernel ur port is good in working conditions so do this

Whenever u want to charge phone turn the screen on and then plug in it will charge ...

If the screen is off or in deepsleep it will not detect the charger ...

Dev already working for the fix .....:)
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
Battery of new build if anybody interested in it ...

Medium usage all time jio ...
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] birdman:
After clean installation again, the often hung blank screen and reboots are stopped, apart from clean installation, i did the following too:-

1. Installed Magisk 17.1 stable version from 17.2 beta

2. Greenify latest stable version from beta

The another issue that i observed when i try to connect to laptop using windows 10 feature "Connect" and on aex 6.0 using cast.

When i click to connect, my aex6.0 system UI reboots and phone gets locked with wifi, bluetooth being restarted.

The same can be reproduced everytime when i try to connect.

PFA the logs for reference.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
I don't know what to say, flashing AEX 6.0 Kernel 4.4, has been for me the most hard unpredictable and different task I've performed so far, due its unexpected behaviors.

I was pretty much used to simply perform a quick dirty flash with previous AEX builds that I neither could imagine to have to re-flash a ZUI stock Chinese ROM by mean of the Qualcomm QPST!

I have understood a lesson: something that works for ten people doesn't necessarily means that will works for you as well.

Now I known.

Regard,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] devashish90:
Can you please share the full device usage ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Kaenryu23:
Problema rete dati

I saw that with two sims, if you try to change the data network, disable both sims, try to see if it happens to you too
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
Ciao,

Questo forum prevede di scrivere usando la lingua inglese.

Please try to formulate again your question, using the default idiom.

Thanks,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Kaenryu23:
Sorry, I noticed that with two sims inserted in the slots if you try to change the preference of the data network are disabled both sims, try to see if it happens to you too
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Enzoselvis:
1) Miracast - Screen Mirroring (smartphone vs tv) no work ;

2)Shazam works, but after a simple reboot no work.

3) u-touch sx customization?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
I'm Italian but I would like you to resend your message in order to possibly receive many more feedbacks by other users.

I've tried on my device and your report is right: trying to switching cellular dara from one SIM to other causes the disabling of both the SIM.

It could be a bug of this ROM or a common behavior, I don't know because I've never tried before on others ROM or builds.

Probably the only solution to re-enable the SIM, is by rebooting the phone.

Thanks for reporting this issue!

Ciao,
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Sam Tyagi:
I already had the latest bootloader. i can boot the latest build but that's it. After booting up, the touch stops responding. I tried this both ways( with /without gapps) and with magisk latest beta. Also i always prefer clean flash ... Can anyone explain this?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] samartht:
Bro I used this file and successfully updated my bootloader and also was able to flash aex but when I set it up ,it kept rebooting after one minute from every boot ,there were random freezes , so I flashed arrow os pie and the same thing happened again ( this didn't happen earlier before flashing the new baseband ) and all other roms I'm trying to flash just say encryption error or even if they boot they just randomly freeze and keep rebooting , can someone please help ?

Is there a way to go back to the older baseband that I was on and all roms flashed perfectly ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] pipyakas:
Took me a while to have the time to test, but nontheless I found the latest version that doesn't have this bug, which is October 15th. All versions after that crashed randomly in different Gapps for me
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mragentofchaos:
It seems like battery usage is not resetting after reaching 100%. I am unable to share a screenshot, but my battery graph is showing a timeline of 42hrs, even though my phone has been charged to 100% twice in that time. I hope this is fixed. My phone now shows 6hrs 33 mins SoT and I still have 16% left. ?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] ThiagoScala:
Hum... I think i will wait a couple more updates ... For what i can see is not good for me yet.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] aachman:
My VoLTE stopped working after a reboot. It was working perfectly when I flashed the ROM. After I rebooted my device the VoLTE icon is gone from the status bar and also the VoLTE option is not there in sim settings. Right now I can access the internet but unable to place calls. Any help would be appreciated.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] LAKSHMI SAINATH:
Hoping so...

But all of sudden when i connect to charge my phone it gets over heated....

Don't know exactly from where the problem occurred now my phone is completely dead i think....
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
Not a rom problem im using this build since 2 days no bugs found yet no overheating at all
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] LAKSHMI SAINATH:
I too saying their was no problem with rom...

Just saying my opinion that's it...

After 3 long hours struggle finally got my device in working state...

Due to excess heat IC connection in board got disconnected and soldered again now working fineee...
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Gauravism:
Just use latest twrp by kuber and flash some stock rom through twrp. Then do a clean flash of some other rom.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Kaenryu23:
I also noticed that the apn with the Vodafone are wrong, there was that of ho.mobile, I had to put it manually.

I've also noticed that widgets are struggling to work on startup
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Thejüs T M:
Chromecast do works inapps (photos YouTube etc)

But screen mirroring or cast doesnt work
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] _DsP_:
Disable vibration on charging.

Had same issue.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] pipyakas:
I just got a black screen freeze from doing nothing, tried to force reboot the phone and when it wakes up, I connected it to the pc but got zero logs out of it.

Doing adb shell dmesg > dmesg.txt from PC result in a "Permission denied" error, and adb shell cat /proc/last_kmsg > kmsg.txt gave a "file not found" error
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] ultimatebharath:
Fix for Volte

For all the users whose Volte is not working after all the attempts, i found a solution.

My Volte stopped working 3 days back &I tried all the ways mentioned in all the forums, changed multiple roms Android O & also Pie but no luck. Finally today i found a solution.

My previous baseband version was 1.76 and Volte is been working from past 1 year but now suddenly stopped working from 4 days.

I just flashed baseband 2.0 using twrp and then restarted mobile , then Volte started working and even the signal reception was dam good than before.

Steps :

1. Download the file from the below-attached link.

2. Reboot the phone to TWRP.

3. Install the Baseband file.

4. Wipe dalvik and cache.

5. Restart the mobile (Phone vibrates for 5 seconds approximate but boots up).

6. Check Volte it should be working now.

Note: It worked for me not sure whether it will for everyone or not. I'm not responsible if anything goes wrong but it went very smooth for me.

Link to download : https://drive.google.com/open?id=1zmIOKJmnk57HKhP_U_d_S-W-gDQIjlzP

Hit like if worked.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] samartht:
Thanks man i did it !

Thanks for the detailed description i have successfully flashed the firmware through qfil (yeah my bootloader wasnt locked as well) and now im gonna try and flash aex , hopefully it works :)

PS : YUP AEX 6.0 BOOTED !
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Aqilz:
Anyone know why my camera keeps stopping? And everytime I open google photos, it will crash showing camera keeps stopping. I replaced camera and gallery with OpenGapps aroma installer.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
Glad that it has worked for you as well!

---------- Post added at 01:16 PM ---------- Previous post was at 01:14 PM ----------

I removed default camera due the FC and installed Arnova pixel3 modded Camera which works flawlessly.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] atmauki:
My first impressions, this rom is awesome

Firstly, i try dirty flashed from latest aex alpha build, i found many crashed app.

Then i try again clean flash, wipe cache dalvick, data, and system. After first boot, i check every stock app and i haven't found bug.

Then i flashed gapps, wipe data again, and everything works great.

After that i flashed magisk 17.1, the magisk hide working great. I used banking app and work perfectly.

Thanks so much for developer, :good:
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Vijaypatildcz2:
How to check current bootloader version?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
Many people asked for that (including myself) but nobody get the answer, then the only way is you try to flash new ROM, if it works you have a new boot loader, if fails you don't and you have to follow the less user friendly QFIL procedure.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] STARK0711:
Can u link the camera ur using ... I m not able to see camera performance any good ...
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
GCam_5.3.015-Pixel3Mod-Arnova8G2-1.4.apk

Go on celsoazevedo.com
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] -totonio-:
The ROM is fully working and awesome.

But I have a problem running SimCity Buildit, crashes at opening, I was on Pixel Experience (9) and it was working.

Backtrace points to libs3e_android.so, with signal 4 (SIGILL), code 1 (ILL_ILLOPC).

Attached a logcat from installation to crash.

Thank you!
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] sethiz:
How to get rid of "Device is HD capable" ?

Also, encountering problem with navbar when it is hidden while playing a game like in pubg, but still it gets pressed and comes to home screen. Any solutions?

I am on AEX build 3rd November 2018.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] frozenfirevr:
I've used this ROM sparingly for a day now... I'm going to stick with it, but in my opinion, gaming performance (I used different graphics drivers though) and battery life seem to have been better on 5.8. I've tried newer graphics drivers on this ROM too. Seemed to have helped a bit, but not too sure.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] wede6:
Have just installed November build,clean install from October build, boot perfectly, everything is good for now, ROM very fast,

Thanks to developer
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] LAKSHMI SAINATH:
Did u tried using Tez form me it was not working failed to signing

---------- Post added at 04:32 PM ---------- Previous post was at 04:29 PM ----------

Does anyone has tried Tez I can't able to sign in....
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] asfhdna:
Guys pls help , I'm on aex5.7 and pubg ,volte are all wrking well (kudos to the developer) and I was wondering to upgrade to pie ....

Pls tell me whether is it worth it or not since this is in Alfa stage :confused:
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] ultimatebharath:
Everything is working perfect if you clean flash. Even i play pubg a lot and it was very smooth & no lags. I didn't changed any kernel. Getting SOT around 3 hours when playing pubg. So for normal usage i think it will last for around 5 hours.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Dark0ne_:
Is there twrp flashable so I can make it system ? Or apk only ? How to deleted the system comera?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Black_ice_Spain:
on last version with moxie kernel (can't run 4.4 bcs of blue screen), android auto is not working :S (was working fine before).

also... is there a way to install the new bootloader (to make 4.4 work) without wiping the phone?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
If I'm not wrong you can transform a user app into system app with a specific app.

I'm sorry, I don't know if exists a TWRP flashable zip of this camera version.

I uninstalled the buggy system camera app using this:

#System App Safe Remover#, download link：https://play.google.com/store/apps/details?id=com.jumobile.manager.systemapp
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Dark0ne_:
Okay thanks!
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
When you use your time to write the word "thanks" you could instead click onto the "thank-icon" on the low

left

corner, I meant right corner of the message box, in this way the poster can increase his thanks-meter :D
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] Dark0ne_:
I installed the camera 5.3.015 it works fine but when I click on the view pic it opens google photos all photos. Is this normal ? If I wait a bit It opens the pic not all pics in google photos
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] nonamesry:
I'm on 1.70 bootloader, arrow os pie build. Can I clean flash this rom? Or should I update something?
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] mcalistri:
It is normal, or better, I get same behavior like you.

We need to consider some time to the picture being processed by the camera app, especially if you select some special effect as HDR or others additional features and also if you enabled the synchronization of the phone photos folder to Google Photo, the time of transfer the image. But it is matter of few seconds and it is not an issue in my opinion.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] subhrabhadra:
It worked. Magisk not needed also.
[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] priyanshu16:
I failed to use the method 1: using the command "adb reboot edl" (my device was just shutting-down and never enter into EDL mode as requested by QFIL.

I used successfully the method 2: using Volume+ and Power buttons:

1. disconnect USB cable and turn the phone completely off

2. press volume-up, and keep it pressed until further notice

3. press power button, keep it pressed for about 1/2 a second (yeah, that timing thing...)

4. insert usb cable (both volume-up and power still pressed at this point)

5. wait for short vibration - you should also see the ZUK logo flash on screen for a split second

6. now you can release both power and volume-up, you should already see the USB device coming up on PC

If anything different happens, just disconnect, power-off and start again... Have fun!

When you finish the flashing of the ZUI QPST ROM, you should reboot and set the 4G to extended capabilities, in case you have VoLTE on your area.

Then you need to verify if your boot-loader is still unlocked (as mine was) in case it being locked you must proceed to unlock it again as you did the first time.