yashsingh1/xdaforums huggingface dataset:
[Zuk Z1 Q&A, Help & Troubleshooting] xavieramoros:
I think there are just a few ones that have real problems with the Wifi, maybe because a manufacturing problem. I am no talking about problems when you hold it in the antenna area, but just real slow connection 10 meters far from the router.

I have compared the reception of the ZUK Z1 against an Iphone 4, a One Plus 1 and One Plus 2. Not just looking at the Wifi bars but doing a proper speed test using an app like DeadSpot Wifi which makes an 60 sec average of connection speed. I've tested with different Wifi band configurations (2.4Ghz, 5Ghz or both), with different distances (2m, 10m, with or without walls) with the last system updates or resetting to factory settings.

The best I've got in connection speed is like 20-30Mbps 2m far from the router. At 10m (with direct line of sight) the speed was 0.2-0.5Mbps which is the same as not having wireless. To compare, a One Plus 2 was getting 800Mbps while I was getting 0.5Mbps (same router, same distance...)

I wish it was a software problem but I think it's just a plain manufacturing problem (these things happen even to Apple) related otherwise more people would have the issue.
[Zuk Z1 Q&A, Help & Troubleshooting] othe01:
I get 60 mbps in my living room where the router is located and in the bathroom where my galaxy s4 mini gets no signal at all i still get 20 mbps.
[Zuk Z1 Q&A, Help & Troubleshooting] dp12776:
Partial refund

I wrote to tomtop who sells the phone through Spanish eBay (where I bought it for 279 euro). They recognise the problem and offered me a partial refund of 15 euro. I have declined that offer and am eager to see how they will handle this rma.
[Zuk Z1 Q&A, Help & Troubleshooting] othe01:
Send it back, get a full refund and order from Amazon.

What i would do.
[Zuk Z1 Q&A, Help & Troubleshooting] Franco Banco:
I also ordered from tomtop yesterday, when I receive it with same problems I sent it back
[Zuk Z1 Q&A, Help & Troubleshooting] xavieramoros:
They offered me 10euros and then half the price (140€). But communications is really slow with them. I will just return it as soon as they send me the address.
[Zuk Z1 Q&A, Help & Troubleshooting] tuatara42:
Here is what fixed the poor wifi performance for me:

Whenever the router (2.4GHz) settings are on auto mode for the channel, I mostly get very poor reception (1-4Mbps). However, when I change to a fixed channel, speeds go up to a consistent ~48Mbps.

I could reproduce this behaviour several times now (tried like 8 times to change channel from auto to a fixed one and back)! Auto=bad, fixed channel=good performance.

This is not due to the router, as I have low Mbps at work too and those APs are on auto mode as well.

I would not be able to judge whether or not this is a hardware problem or just a cyanogen/driver bug in how it's handling channel switching or a problem in handling crowded channels.

What definitely seems to be a cyanogen bug (or feature) is the drop in speed upon standby mode. If you google that, you'll find the same thing happens on some cyanogen (mod) versions on other phones (something about power saving - even when you set it to keep WiFi on on standby).

Cheers.

Edit:

I checked all channels manually: channels 1, 6, 11 & 12 are the ones performing badly. All other channels give me good speeds.

Except for 12, those are also the channels my neighbours' routers default to (5-6 routers on those channels each).
[Zuk Z1 Q&A, Help & Troubleshooting] man.jung.2015:
I have no problems with the wifi. Tested with 2 different routers.

Also compared with a Nexus 5 and ZUK Z1 is better ...

I have bought my Z1 from Amazon.

To the people who have the problem : where did you buy it ?
[Zuk Z1 Q&A, Help & Troubleshooting] tuatara42:
Zuk via Amazon
[Zuk Z1 Q&A, Help & Troubleshooting] IceDBear:
Amazon.it. I have mixed results with wifi. Reception is good, better then my old Xperia T, but speeds are all over the place. Streaming video from my NAS is a nightmare, lots of stuttering, but downloading the video was fast without slow downs...
[Zuk Z1 Q&A, Help & Troubleshooting] deejaycarras:
I just buy one Zuk in Amazon (299€)

Tomorrow arrives, when the phone arrives i will try Wifi Connection without updates then i will do all updates and will try the Wifi connection.

I will leave my feedback.
[Zuk Z1 Q&A, Help & Troubleshooting] Sblast:
Thank you, deejaycarras.

Guys, send them emails and send the phones back. There is no other way, else they will not fix it. I sent them an email to this thread.

You can send your complains via: http://www.zukmobile.cc/contacts/index/

as well.
[Zuk Z1 Q&A, Help & Troubleshooting] Franco Banco:
I sent message by chat and they did not knew about the problem:confused:

Chat started

You — Update your info

hallo,is the wifi problem issue solved by now?See XDA site?

Maxime joined the chat

Maxime

Hallo

Which problem ? Could you send me the topic ?

You — Update your info

http://xdaforums.com/zuk-z1/help/poor-wifi-5hz-n-reception-zuk-z1-t3226600

Maxime

I wasn't aware of this

I transfer this to my ZUK contact to know more about that

You — Update your info

So nothing changed then
[Zuk Z1 Q&A, Help & Troubleshooting] deejaycarras:
Good Morning guys, this is my feedback of my new Zuk Z1 just received:

The phone comes with YOG4PAS2NM from Amazon.

I just try Wifi Connection in my kitchen (2 Walls from Router) and my bedroom (1 Wall from Router)

-FACTORY ROM: (YOG4PAS2NM)

[MENTION=1840490]kitchen[/MENTION]: One Hand (Phone in Vertical) Conexion is like my old SIII (Wifi show full rows).

Two Hands (Phone in Horizontal) Conexion goes down (2-3 rows) and disconnects.

[MENTION=5100020]bedroom[/MENTION]: One and two Hands Conexion is full rows.

-FIRST UPDATE: (YOG4PAS2RM)

[MENTION=1840490]kitchen[/MENTION]: One Hand (Phone in Vertical) Conexion is like my old SIII (Wifi show full rows).

Two Hands (Phone in Horizontal) Conexion goes down (2-3 rows) and disconnects.

[MENTION=5100020]bedroom[/MENTION]: One and two Hands Conexion is full rows.

-UPDATE 2: (YOG4PAS2WM)

[MENTION=1840490]kitchen[/MENTION]: One Hand (Phone in Vertical) Conexion is like my old SIII (Wifi show full rows).

Two Hands (Phone in Horizontal) Conexion goes down (2-3 rows) and disconnects.

[MENTION=5100020]bedroom[/MENTION]: One and two Hands Conexion is full rows.

-UPDATE 3: (YOG4PAS34N)

[MENTION=1840490]kitchen[/MENTION]: One Hand (Phone in Vertical) Conexion is like my old SIII (Wifi show full rows).

Two Hands (Phone in Horizontal) Conexion goes down (2-3 rows) and disconnects.

[MENTION=5100020]bedroom[/MENTION]: One and two Hands Conexion is full rows.

-UPDATE 4: (YOG4PAS38J)

[MENTION=1840490]kitchen[/MENTION]: One Hand (Phone in Vertical) Conexion is like my old SIII (Wifi show full rows).

Two Hands (Phone in Horizontal) Conexion goes down (2-3 rows) and disconnects.

[MENTION=5100020]bedroom[/MENTION]: One and two Hands Conexion is full rows.

Conclusion, with all updates the Wifi behavoir is the same in all of cases. Few times I use the phone in horizontal position, maybe for me is not a big problem, I wish Zuk or Cyanogenmod solves this issue with Software Update (If this is caused by poor of wifi management).
[Zuk Z1 Q&A, Help & Troubleshooting] Life Engineer:
Wow nice practical tests!

My phone is on route now... I hope they fix it soon!
[Zuk Z1 Q&A, Help & Troubleshooting] dp12776:
Tried but no succes

Thanks for explaining this. Thought i finally had a solution. Alas, it didn't work for me. In fact i found out that my router was already on a fixed channel 11. I tried changing it but no difference. I have now set it to auto. Still the same.

Tomtop offered me 18 euro and now today 40 euro. They seem willing enough to help, but I keep insisting that I need a working phone and they keep trying to buy me off with a refund.
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
It'd be great if we could clarify whether:

- is it a batch of defective units? Or it occurs to all the ZUKs out there? People that doesn't have any problem, are they 100% sure that if they try to cover with their hands the superior part of the mobile, the wifi signal does not deteriorate?

- is it hardware or software? The easiest way to know this could be to access to some ZUK Z1 Chinese community where they don't use CM. Unless ZUK has reserved the defective units to the European continent, some of those guys should have the same problems (?)

Mine was also from tomtop, and I am also thinking about returning it, but then what? Buying from amazon doesn't guarantee anything.
[Zuk Z1 Q&A, Help & Troubleshooting] othe01:
Mine is from Amazon.de and the Wifi has the same issue when i cover it up.
[Zuk Z1 Q&A, Help & Troubleshooting] Hanswurst02:
Mine is underway, also Amazon Germany.

I will report the results compared to my Nexus 5.
[Zuk Z1 Q&A, Help & Troubleshooting] robin-sips:
same problem here, random drops of wifi speed :s no fix available yet?
[Zuk Z1 Q&A, Help & Troubleshooting] Hanswurst02:
I got mine today. No problems with the wifi as of yet.

I'm now on the latest Update.

It's better than the reception on my old Nexus 5.

I can however block the signal with my hand on the top of the phone. I'm getting another one on Monday, so I can compare the two.

I'm using 2,4Ghz on Auto Channel.
[Zuk Z1 Q&A, Help & Troubleshooting] Frankie73:
Before ordering my Z1 via amazon.de I asked there if anybody can confirm those WiFi problems. 4 ppl answered my question until now and they all said that they don't have any problems. Also, in the product reviews, some ppl say that WiFi reception is better then with their previous phones (S6, Z3, Nexus 5 iirc). So maybe there are just problems with a certain batch? Or maybe there's a difference between the white and the grey version? Which ones do the ppl with problems here have?
[Zuk Z1 Q&A, Help & Troubleshooting] xavieramoros:
I think a lot of people look at the Wifi Signal Strength Bars to judge if the Wifi is ok. At least in my case (I already returned mine), despite having the Wifi Bars to the max (very close to the router), the speed was very slow (2-3 Mbps) compared to other phones.

Batch color is not the problem, I know personally people with the same problem on both versions, having bought from Amazon or Ebay.

Maybe the following solution fixes it, at least for some it does:

But you can't always channel the router configuration.
[Zuk Z1 Q&A, Help & Troubleshooting] guy6136206:
I own the letv le1 and i almost order this phone, it was a smart move to chack it in here before buying, because the only reason that i want to trade my letv is the poor wifi.

From my experience the wifi wont fiz with updates, it's probably an hardware problem.
[Zuk Z1 Q&A, Help & Troubleshooting] marszalek1:
I don't have a problem too

My zuk has a very good wifi better then my old nexus 4 witch has a good wifi. I've got a black international version
[Zuk Z1 Q&A, Help & Troubleshooting] GeorgiUzunov1990:
Did anyone buy a ZUK from Honorbuy ? I was thinking about ordering one from there and don't want to send it back..
[Zuk Z1 Q&A, Help & Troubleshooting] Brutalibus:
My zuk reception is better than my old note 2,but when I cover the top I can see that signal is lower.,but it doesn't drop. I must send back?

Inviato dal mio Z1 utilizzando Tapatalk
[Zuk Z1 Q&A, Help & Troubleshooting] :
Can you confirm if WiFi is still disconnecting while in your pocket?

Are mobile data connecting while in your pocket or also unstable?
[Zuk Z1 Q&A, Help & Troubleshooting] Brutalibus:
While is in my pocket it keeps the connection
[Zuk Z1 Q&A, Help & Troubleshooting] :
There are good news.

Can you confirm if the WiFi issue is also affecting the mobile data connections or the phone coverage?

Thanks
[Zuk Z1 Q&A, Help & Troubleshooting] Brutalibus:
No, it doesn't affect mobile signal or mobile data. Have you got same problem with Wi-Fi?
[Zuk Z1 Q&A, Help & Troubleshooting] :
I'm waiting for my unit, that will arrive in 2-3 days.

In August I have own one, but no WiFi in my house...
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
I can say my wifi is worse than with my nexus 4.

- I cannot connect to my 5 GHz wifi where I can with my nexus 4.

- With my 2.4 GHz the wifi speed is worse than in the nexus.

The two measures are in places where the wifi is far. That said, judging from coverage I should say I have a total coverage for the 2.4 GHz, but then again the speed is worse. If I do the measurements closer to the router, both mobiles give similar measurements if not better for the ZUK.

*For my typical use I don't see the difference in speed, but I'm not really using the mobile when I am at home, just browsing and texting, so the impact is low.

This is one problem, which one could argue this is because there is a cheap chip in the ZUK, but then there're users that claim their wifi is indeed better than with the nexus. Could anybody with both mobiles compare them in difficult positions? This is, going far from the router?

Another problem is that covering the mobile from the superior part dramatically affects the wifi (doesn't seem to affect mobile data). This sounds like a hardware problem and everybody can imagine what would happen if a problem like this appears in the iphone 6 plus, right? People that claim that their ZUK is not affected by this, could they really cover their (top-part) mobile and measure the wifi with an app like "Wi-fi deadspot"?

What is completely wrong is the silence from Lenovo-ZUK.
[Zuk Z1 Q&A, Help & Troubleshooting] Atlantic7:
I also have both phones. I have a 100Mbps internet connection and 2 meters appart from the router the ZUK goes up to 90 Mbps in a speed test, while the nexus 4 just reaches 40 Mbps. When I do the same test from my bedroom, that is like 15 metters appart from the router, the nexus 4 still gets about 10 Mbps and the ZUK barely gets to Ping in the test and when it does it never reaches 500Kbps.

I also get a big drop in speed in the ZUK when I cover the top part of the phone ( just touching the metal edge is enough)

Everthing else in the phone is perfect. Great device, but Lenovo and Cyanogen must work on a fix for the WiFi signal ASAP.
[Zuk Z1 Q&A, Help & Troubleshooting] GeorgiUzunov1990:
So is the wifi bug affecting all ZUK Z1s ? Is there an official statement from Lenovo/ZUK that they are acknowledging this problem ?
[Zuk Z1 Q&A, Help & Troubleshooting] Ta3iapxHs:
deal breaker

As many have said before me this is a serious deal breaker.. So it's important for many people to find out the truth.

I for one was about to order it until I read this thread.

So..

can those who stated that their ZUK Z1's WiFi is fine, try the "hand-on-the-phone-signal-drop"? so maybe we can see if there are at least some devices that actually work?

Thanks

*edit: for those having the problem, a video of it uploaded to YouTube would help spread the news and maybe get a fix faster.. (if it's not hardware, in which case.. $#@%)
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
Here there is a youtube

https://www.youtube.com/watch?v=tvxsm5_UyVE

The ZUK service has forward me a software solution with two zip files, one big enough (900Mb) to mean a complete SO upgrade. I attach the instructions, good luck if you understand anything. I am sad but ZUK is not building a good reputation here.

The good news is that apparently, someone believes this can be fixed by software.

The bad news, it is an obfuscated procedure that I'd say it will break the cyanogen experience (and OTA's upgrade I guess).

The second bad news is that if this is a software thing, I'd have guessed that they'd have contacted the CM people to release an urgent update, not that they'd provide isolated solutions. This way of doing things doesn't say anything good about the future.

Honestly, don't know what to think. I am trying to return it to the ebay seller unless someone from Zuk or CM provides a clear answer in the following days.
[Zuk Z1 Q&A, Help & Troubleshooting] dp12776:
Wow, that is some heavy sh*t. Even for a Chinese company it is a bit wild to expect us all to go through that procedure. May I askask what you have replied to them?

As for my case, Tomtop wrote me this morning to tell me that they would ask ZUK what to do with my request for a replacement.
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
The truth, that it was above my knowledge. But, even if I could do that, this solution is not acceptable. This is not serious.
[Zuk Z1 Q&A, Help & Troubleshooting] MUG3NHC:
I've just tested my ZUK and i dont have any serious wifi issues. Around the router i get near max speed, several meters away, behind two or three walls the same. When i cover the top of the phone, the speed goes down 5~8MB.
[Zuk Z1 Q&A, Help & Troubleshooting] tuatara42:
@ Gerardgerard

Could you maybe upload those files and share the links please?

Thank you so much!
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
Here there are the 2 mega links

https://mega.nz/#!sU1HVByY!lgM5Ba931GpBS7ozGBdvC8PiOxuv5W-ecHlC8L6iXso

https://mega.nz/#!ZE0j1SwD!URglG_dGQh3DCKiynCmR-aHa97s0UQHwwSGFrur7e8E

It would be great if any expert here could say if this is fixable by software or not. From the outside it really seems impossible that this can be a non-hardware thing ...

*From the service what they say is that since they don't have any unit with this problem, they are unsure about whether it can be fixed or not.
[Zuk Z1 Q&A, Help & Troubleshooting] tuatara42:
Actually, we should clarify that throughout the thread we're talking about different things:

One problem is that when covering the upper right corner with your fingers that reception drops. This is certainly related to the hardware, more specifically the antenna, I guess. For me, this is not so bad especially since I don't touch/cover the upper right corner very often. Also the drop isn't that massive for me.

The second issue is poor reception in general for some of us in some constellations. Mine at home I could fix with changing to a fixed channel. Since then it's fine. I have consistently much higher speeds now. On some routers I still have problems. On 5GHz routers (the ones i came across so far) the speed is really amazingly fast. This I'd think might be a software/driver issue or it might not. I wouldn't want to jump to conclusions.

The third issue is loss of connection upon putting the device to sleep (when you activate the screen, WiFi had been lost and the icon comes back a second after or so, which doesn't happen all the time but if it has been sleeping for longer - deep sleep issue?) and a drop in speed in sleep mode even though WiFi is set to keeping it on.

This has been described on other phones running COS or COM so would seem to be a software issue.

[MENTION=6968760]gerardgerard[/MENTION]

I don't get why there is so much hatred towards Zuk. According to your post, you described one error to them and they replied pretty quickly with what they to think might be a potential fix even though they couldn't test it because they don't have a unit to test it with.

What is described in the howto is basically to start up the Z1 in a special download mode, fire up their software and flash something on the emmc. The rest are instructions in case something goes wrong. It's not more complicated than rooting, from what I've seen in there.

Someone that has some experience in android development should maybe look into these files, what they are and what this potential fix would do.

Maybe some of the questions about these issues would also be more appropriately directed towards Cyanogen. After all they supply the OS and the driver implementations. And by now they are pretty slow with updates. Stuff in the other threads like microlag, noise problem (which were fixed by an update) etc are also really a Cyanogen OS thing...

The cyanogen community board may be the place to check out and make them aware of some issues.

Cheers.
[Zuk Z1 Q&A, Help & Troubleshooting] gerardgerard:
No hate from my side, I indeed consider ZUK the new Nexus brand and I am very happy with this phone (wifigate aside).

But honestly, the answer I have received was a good answer for a developer, but a really bad answer to the final client. How can I now recommend this phone to my mother or my non-tech brother or friend? I cannot. Would I have bought the phone if I had known about this? Definitively not, I'd have waited. And it is hard to believe they don't have any unit, as only in this forum we're a few people with identical issues. But that's only my opinion.

That said, tomtop-ebay is absolutely collaborative, and the communication with ZUK service has been nice and fluid.

*I would like to see your face if your receive a similar mail if you have a faulty dishwasher unit in your home :cowboy:
[Zuk Z1 Q&A, Help & Troubleshooting] tuatara42:
Maybe you're right. Being on xda I always forget about non-tech people. From a consumer point of view this would sound scary, I guess. Sorry for that.

Concerning the dishwasher: being in the UK you wouldn't believe what you get used to :P

What came to mind: I wouldn't have noticed about any WiFi issue really hadn't it been mentioned here. I just checked with the wifi deadspot app because i was curious. On that note: how accurate is WiFi deadspot?
[Zuk Z1 Q&A, Help & Troubleshooting] Atlantic7:
I feel they are collaborative but just one email per day, and some times I really feel they are having so many requests about this issue that I get a "standard" reply. Today´s message was almost identical to the last one and did not reply any of my questions.

Anyway...The solution the ZUK support are giving you might be just the Chinese ZUI rom that they put on the chinese version of the phone and not a patch for Cyanogen. If they really don´t have any units with the problem it might be because they don´t have any Cyanogen OS units. And that would be good news because it would mean it´s a sofware related issue. We then should ask for CM to fix the problem via OTA as soon as possible.

I guess they are aware of the issue at this time, because in every forum (even on the Cyanogen OS) there are threads about it.
[Zuk Z1 Q&A, Help & Troubleshooting] Teo128:
Hello today I tested Mine CM Z1 vs my MAHDI Nexus4 with wifi deadspot using my 2.4ghz router

They have similar speed the, Nexus 4 behave a little better near the router and the Z1 a little better farther from the router

BOTH score 10/14mbs two stories below the router and in

BOTH

the speed drops drastically if you put your hand on top of the device.
[Zuk Z1 Q&A, Help & Troubleshooting] Teo128:
Both device were tested on the same spot in the same room of the 2.4ghz router without the case.

Z1 flat onto the bed

NEXUS 4 flat on the bed

Z1 held horizontally with hand onto the antenna

Nexus 4 held horizontally with hand onto the antenna
[Zuk Z1 Q&A, Help & Troubleshooting] dp12776:
I have also been happy enough with Tomtop so far, except for the "strictly only one email per day". This was until today when they just suggested that I should update my phone..... Really? No mention of what to or with what or from what. Just "update your phone".

I'm still sticking to the diplomatic and patient line and replied that my phone is currently on the newest software and that there are no OTA updates available.

They've stopped offering me tiny little bribes.
[Zuk Z1 Q&A, Help & Troubleshooting] :
All the people that has the WiFi issue has buy the phone at toptom?
[Zuk Z1 Q&A, Help & Troubleshooting] Kbayli68:
I bought the phone yesterday.

I sent a message to costcobuy seller on ebay about this issue.

Here is his reply :

"This is that you can download directly open the installation package can solve the problem of WIFI

MEGA extraction code: N7fTaHa931qZiIVtf47YVw

Tips: Z1 does not support WPA / WPA2 WAPI / WAPI-PSK encryption both ways. WIFI see whether the customer has a problem with these two encryption methods, if it is, so that they will change the WIFI router WEP encryption or WPA-PSK / WPA2-PSK or not encrypted"

I tested my Wifi with a galaxy S3 and i noticed the same thing : decrease of Wifi when i put my hand on the top of the phone.
[Zuk Z1 Q&A, Help & Troubleshooting] dp12776:
Interesting, but other than the encryption, what does it mean?