yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] agentdr8:
See attached. Here are the parts I used:

- generic 1A diode from RS

- NTE331 NPN transistor (NTE377 would work too, but Fry's was out of this)

- NTE R46-5D12-12 miniature relay

- NTE VHT1000M16 1000uF 16V high-temp radial capacitor.

I mounted all of my components on a plated board and put it inside a project enclosure that I also found at Frys. I connected the constant 12V to both the collector of the 331 and to pin 1 of the relay (pin 87 on a bosch-style). I didn't fuse any of the inputs, as I attached it inline of my headunit, which already had a fuse on both the red & yellow 12V lines.

There are pictures in the thread. I believe the first post has a link to the discussion about wiring the external mic to the BT board.
[MTCB Android Head Units Q&A] dvandorenmalen:
Great work!

---------- Post added at 11:44 PM ---------- Previous post was at 11:39 PM ----------

Great work!

I would like to do the same mod but I could sure use some pictures to guide me through it.

Thanks again for this great mod!
[MTCB Android Head Units Q&A] fern420:
Hello and thankyou in advance for any insight you guys can offer. I have a JY V2.08 (G2110 From ebay) and my WIFI is ridiculously slow, less than .05 MBS when sitting right on the router, I've tried multiple access points and hot spots, all the same dismal result yet the signal is fantastic and strong. It took almost 10 minutes just to update google maps, it's been downloading sygic maps for over an hour now. Is this normal for this unit or could mine be defective? is there a better software version I should be using that eliminates this WIFI issue? I didn't see anyone else mention painfully slow WIFI so just curious if I do perhaps have a bad unit.
[MTCB Android Head Units Q&A] agentdr8:
That sounds very similar to the wifi issues that plagued these headunits when v1.86 came out. The solution back then was to flash just the v1.77 kernel, which usually resolved the slow wifi. If you're still on 4.2.2, you could flash the 1.77 kernel to see if it helps. Haven't heard of anyone having wifi issues with the newer 4.4.2 images.
[MTCB Android Head Units Q&A] fern420:
Thanks for the quick reply, I will give that a shot and see how it goes. I just flashed the proper JY 2.08 MCU for unit along with the newest official KGL_V_2.09 update but it still has the super slow WIFI.

---------- Post added at 06:07 AM ---------- Previous post was at 05:25 AM ----------

Flashed it to 1.77 but still have the super slow WIFI. Open to any other suggestions anyone might have.
[MTCB Android Head Units Q&A] illmatik:
Having a strange problem that popped out of nowhere.

1. The brightness setting only seems to stay for a few minutes. At night, I'll turn the brightness all the way down, and within a few minutes it turns back to 100%.

2. The screen is also automatically turning on after a few minutes when I turn it off by holding the mute button.

I noticed this this morning on my drive into work (in the dark) and it was very distracting. I ended up turning the unit off altogether.
[MTCB Android Head Units Q&A] spankaroo:
Bluetooth dongle?

Has anyone tried using a USB bluetooth dongle yet? Info is sparse, but I've seen a few posts about how BT dongles should be supported in Kitkat. It may be that we need to push the BT stack back into our ROM to support it -- if it has been ripped out.

I would think adding a BT dongle would be cheap, and would get us all back on the path of being able to use any Android app for dialling, contacts, calls, etc... not to mention the ODB and other devices.
[MTCB Android Head Units Q&A] Warlord711:
Can you please tell me what car model it is ? Looks pretty much like a Golf MK5, i have same unit.

But for me, only a few CANBUS options working. I dont have working voltage display, just handbrake, seat belt and door status open/close (most time not working or 10 sec to late)

Also, what MCU version please.
[MTCB Android Head Units Q&A] typos1:
Its been mentioned several times already in the thread that KK + the 1.77 KGL MCU has fully working two way CAN Bus on VW cars.
[MTCB Android Head Units Q&A] ktibor69:
The app is great!

---------- Post added at 04:16 PM ---------- Previous post was at 04:13 PM ----------
[MTCB Android Head Units Q&A] Warlord711:
Oh sorry, i think i tried 1.77 already but not sure atm.

Going to flash it now.
[MTCB Android Head Units Q&A] fern420:
Didn't seem to help any, my max speed is still .44 MBPS.....argggg
[MTCB Android Head Units Q&A] agentdr8:
I've tried a BT dongle I had that works on linux and KK didn't see it. Probably needs a kernel module. And without a cellular radio and associated RIL, Android won't natively dial numbers and send them over BT to a phone. I'm sure there are apps that can do this though (Tablet Talk being one of them, which I use currently via Wifi hotspot).

Maybe your wifi antenna isn't properly soldered to the board. At least on my GS and my KGL, it's just a single wire antenna lead that they either tape up to the backside of the faceplate, or poke it through a hole in the back.
[MTCB Android Head Units Q&A] fern420:
I somehow fixed it, It was either fixed from flashing around different software and kernels or from unchecking the "WIFI Optimization" check box under the advanced WIFI settings in android; I noticed it was checked by default on the 2.08 software for this unit, It's now got full speed, thanks all; hopefully that will help anyone else who has the slow WIFI problem on these 2.08 MCU units.
[MTCB Android Head Units Q&A] MasterPrenium:
Hello,

It's a golf mk6 from 11/2011. I'm using the last MCU 2.09 KGL4. The door status is also not working for me.
[MTCB Android Head Units Q&A] geezi:
Hi

I just bought this headunit from Autopumpkin. It works and everything but just having sound issues at the momemt

w w w. autopumpkin.com/new-products/pumpkin-car-stereo-pure-android-4-2-dvd-player-radio-head-unit-7-inch-hd-capacitive-touchscreen-with-gps-can-bus-3g-wifi-7-color-button-indicator-remote-control-for-opel-vauxhall-vehicle.html

1.) No matter what I do (electrical tape etc. etc.) There is this bad interference whenever sound is played (music app, video, gps etc). Its like a hissing white noise. I tried ignoring it but when some songs dont have alot of bass or "beat" the sound is just very irritating.

See 1st pic of my wire setup

Second pic is what Autopumpkin says what my wire/cable should be like but my cable is different as you can see from above.

Im not sure what to do anymore, maybe i missed a few wires that need to be connected??? (The headunit works fine though)

Please Help
[MTCB Android Head Units Q&A] MasterPrenium:
Deleted
[MTCB Android Head Units Q&A] OlvrCA:
Netflix

Guys and gals,

When playing anything on Netflix and pressing the Vol + or - the player will pause. Always.

Anybideas on bow to solve this?
[MTCB Android Head Units Q&A] ultradj83:
Wi-Fi

Dears,

anybody other than me with problems on Wi-Fi?

I've got 2 units, in both it works for sometime and the Wi-Fi icon shown all blue bars meaning it receives very strong signal (the AP is very close).

Then, it remains connected but shows all grey bars like there's very poor signal, and stops working.

Wi-Fi off and on and it resumes to work for some time, then the problem happens again.

I tried with different APs.

I'm still on 4.2.2 .

Thanks a lot!
[MTCB Android Head Units Q&A] safak:
BT vs ODB

Hi once more ;

- I have tried a bt usb adapter on 4.4.2 and 4.2.2 ; the device did detect the hardware but as mentioned in the forum , btstack needs to be injected/compiled in the kernel. Awaiting seniors support in this kernek compilation.

- I have contacted the supplier and asked for support from supplier about the issue ; i was advised to reflash 2.09 firmware and mcu.It has not been a solution.4.22 does discover but not pairs with bt obd2 adapter. MTCxposed also has not been a soluton.

- I m not sure if it is a problem but recovery bypasses updating mcucfg.

- I think something blocks pairing with bt ODB2 where i have no porblems with using my mobile.

- Is MCU somehow related with BT discovery and pairing ? Is there a way to force mcucfg to be reset ot flashed ?

Awaiting any comments...

Kind regards
[MTCB Android Head Units Q&A] ktibor69:
Can you give me the link of the app for internal mic gain controlling?
[MTCB Android Head Units Q&A] uncleg:
All dark gray bars or light gray bars ?

Light gray means full signal, but unreachable internet connection.

If it really darkgrayed, try to remove any usb-connected devices (usb-flash, usb-camera etc.) for testing or move them to other usb-port.

Also try to flash booroondook's custom 4.2.2 firmware with 1.77 kernel.

This FW more stable regarding usb/wi-fi working.
[MTCB Android Head Units Q&A] ultradj83:
Well they're light grey bars.

So it fails to detect internet connection, is it possible to avoid this check?

Any time it fails internet connection is working, i see this on other devices.

It's not working with a 3G Wi-Fi router.

Anyway, also connecting a USB 3G dongle, there're internet connection falls, too. In this case I always see strong cellular signal but sometimes the "3G" disappears, I think this means PPPoE goes down, it comes up again in a few seconds.

Thanks!
[MTCB Android Head Units Q&A] uncleg:
unfortunatelly nope.

It depends on cellular operator and AP internal config. Try to call to operator support and ask them.
[MTCB Android Head Units Q&A] ultradj83:
Well there's absolutely no problem with the ISP and on the AP, other devices work perfectly everywhere...

I'm thinking about the firmware you suggested but it's a big modification for a small problem.

Are you actually using this firmware? Any problems on it? Everything's fine with Wi-Fi, Bluetooth and ODB?

Thanks again.
[MTCB Android Head Units Q&A] 1-2-Hak:
Post #530 has it - it is in test phase still though
[MTCB Android Head Units Q&A] drt1394:
Well, things look a lot better with an lcd_density setting of 160. 240 is way too high IMO. I think they went extra large b/c they assume you will want huge buttons to touch while driving (which may be a fair assumption... i haven't tried using the system with my DPI settings on the road at all). Biggest issue at this point is that the bezel overlaps the top of the screen. With a status bar there on 160DPI it is nearly impossible to touch those buttons or read the status updates. Thinking best solution to this would be either: customize status bar (how?) to add margin at the top. or B: If there is a way to add a global padding (a la an "overscan setting) to the android OS. Anyone know anything about either of these options?
[MTCB Android Head Units Q&A] webdude12:
No, the manufacture is not LSQ Star, but they do have some 1280*720 units. As well as almost all their units are available with Android, you just gave to ask for them. My problem with them is they use the Mstar Cpu, lock the bootloader and like HuiFei have no desire in supporting the development community.

The company I am in talks with does not sell in aliexpress, etc. They are located in Korea and have made units for Audiovox and a few other companies for years. I got connected with them through one of my old audio distribution networks. Much like Asus advertises support for open source firmware for their wireless routers, this company plans to do the same for this radio. I'm excited about this radio, but also reluctant that time frames will be as projected
[MTCB Android Head Units Q&A] kwalsh24:
Hmmmm well this makes the decision a bit more difficult lol. Thanks for the information!
[MTCB Android Head Units Q&A] Zaphod-Beeblebrox:
Take a look at this post:

While this was written for the AN21-U (Which I ended up buying. I couldn't find a derivative of these HuiFei units with a 7" screen and NO Dvd in a universal 2-DIN format), The application is the same. You'll want to look into the layouts & dimens of SystemUI (That controls the StatusBar).

Believe it or not, You can do a fair amount of visual tweaking through the layouts without ever getting into the code (smali or otherwise). You won't be able to add or change functionality, but you will likely be able to adjust your spacing/size issues.
[MTCB Android Head Units Q&A] 1-2-Hak:
Oh Nooooo!!!!

Well my speaker crackle was the start of something worse :(

The unit now will not power on....at all. I have checked power and all fuses (including the one on the back of the unit)

This thing is dead as a dodo.......

Let see how well they support their units now!
[MTCB Android Head Units Q&A] kwalsh24:
Not good :( keep us posted!
[MTCB Android Head Units Q&A] KeiserSozeyFr:
Hello everybody,

I am french and I am new here.

I need help, I received my head unit 2 days ago and start to play with it.

The device is Erisin ES9401, It looks like a perfect clone of the huifei model.

I rooted it perfectly with root master and then, I tried to change LCD density with an app called "LCD Density Modder"

And now the device is stucked on a boot loop :'(

Anyone knows if it is possible to access to the file build.prop file to restore the old value ?

If this head unit is really a perfect clone of the huifei, maybe I can try to flash the last ROM image.

But problem is I don't understand how to do it, this device don't have mini USB plug in the front panel, just 2 standard USB on the back.

pleeeeeaaaaaase help me !!!!! :(
[MTCB Android Head Units Q&A] KeiserSozeyFr:
Ok, I restored the factory image from the wiki from recovery with a micro sd card and now the device boots.

But now, the touch screen does not function properly, all the gesture is flipped by 90 degrees.

Anyone knows if there is a parameter to fix it ?

---------- Post added at 10:17 PM ---------- Previous post was at 09:33 PM ----------

Well, I flash the firmware from Hanker and now, all is working perfectly.

I confirm the ERISIN ES9401 is a HUIFEI device, I dismantle the device and the both boards are exactly the same as the HUIFEI.
[MTCB Android Head Units Q&A] kwalsh24:
Thanks for the info keisersozeyfr, where did you get your unit from ? Was curious if your unit would relate to this one or not & sounds like it does
[MTCB Android Head Units Q&A] dark alex:
For the Flipped Touch: I also had this issue after I got a trial update from my supplier. It is the result of flashing an incompatible ROM.

I got the Factory Image inoriginal state from Keylo... Flashed that and all was okay again.

Is there any chance to get the Unit to power off when removing the key instead of when stopping the engine?

A sof my information it should do that but it doesn'T with an Audi A3... :( But it does not just swuitch off like if I removed the power! It is shutting down properly...

Also one Note to the "beep" issue when using lowlevel (chinch) outputs:

Try to get the ground from the same point your amplifier is connected to.

It's annoying but it helps" lowered my erroneous noise by about 90 percent!

Just click out the gnd pin from the quadlock plug and connect it to amplifiers groundwire.
[MTCB Android Head Units Q&A] kwalsh24:
I just browsed all 56 pages of this thread here at work.... still torn haha. Kinda thinking I may hold out for a higher resolution unit, however if thats going to be 3+months before that comes along, I may just have to settle. Will keep my eyes on this and also keep my eyes on what webdude12 finds, as he seems to be keeping his eye on unit(s) with higher resolution screens that may soon come on the market.

All in all tho, great job by all! Sad to see that webdude12 was shafted after all his work, however I am not shocked that once this unit got cracked that the manufacture support started to delay their responses. I'll be shocked to get an email back from the one I sent (16 pages in haha I myself do not have buyer protection options on my forms of payment, so that does concern me with warranty coverage on any unit I get. All I know is, im done with wince units. Android all the way...

Has anyone had any more experiences with the broken clip for the screen? Or has this been resolved by not dealing with 3rd party distributors? The topic didnt really get covered again as the thread moved on, or at least I didnt see if get covered / updated past the units that were reported in with the bad clips.

nexgen10, I believe you mentioned you had purchased a few of these units? Have they been checked for the faulty clip? Also any time frame for when you planned to sell them? Or were/are they spoken for?
[MTCB Android Head Units Q&A] dark alex:
I'm sorry. I disassembled my unit yesterday as my GPS cnnector was damaged and to fix it I needed to remove it from the unit but I forgot to have alook at the screen clips.

BUt as I still have a touch issue and will get a replacement Touchscreen I will open it again and see if there is a hw-rev-number on the part.

My unit seems to be built 2014 and some parts have MFD end of 2013. - If that helps...
[MTCB Android Head Units Q&A] kwalsh24:
Hmm, so it seems to be more than just the screen clip that appears to be breaking on these units? Not a good sign of quality hardware or life span before part failure.

Knowing my luck with how my last unit was & performed over the past 8 or so months, ill likely get a unit thats prone to being torn apart for fixing lol
[MTCB Android Head Units Q&A] lukesan:
[MENTION=5867075]KeiserSozeyFr[/MENTION] exactly the unit I was looking for.

Couple of questions: you can pm me if you want

How long did it take to get it. If I buy it I will need it before I drive to France on holiday ;)

Is the radio reception any good?

How is the GPS reception, speed and accuracy. Maybe a screenshot of gps test or so.
[MTCB Android Head Units Q&A] kwalsh24:
I would like to add a question, hows the build quality? Have you monitored the video clip breaking issue?
[MTCB Android Head Units Q&A] KeiserSozeyFr:
I ordered my unit on ebay :

h t t p : / / w w w .ebay.fr/itm/9401AFR-VW-Tiguan-Golf-5-MK6-Jetta-EOS-8-Android-4-2-2-Autoradio-GPS-BT-Can-bus-/131168767473?pt=FR_JG_Auto_Pieces_Autoradios&hash=item1e8a448df1

As I said, boards inside the unit are exactly the same, I compare it with pictures taken by nextgen10, same boards, same references (KGL-R90), even the wiring diagram stick on top of the unit is the same.

Only front panel is different. Unfortunately, it don't have any mini usb OTG plug.

Also, there is a problem with the front panel, it does not fit the original frame on dashboard. I will have to file the frame.

kwalsh24 : no problem with the clip inside my unit.
[MTCB Android Head Units Q&A] lukesan:
Thx and how is gps and fm reception? Do you have a Golf 5?
[MTCB Android Head Units Q&A] kwalsh24:
Hmm no OTA plug that might be something i;d like to use on the fly, mind you I could just use that on my phone to transfer things, but then again, that would make it easier to plug a pc into the radio for tuning via laptop..... then again could run a usb cable into the glovebox.... hmmmm lol

One thing that I found a little off putting of Keylo / HuiFei, as soon as the issues with the clips happened they immediately put blame on someone else, and didnt say that they would investigate the issue on their end without hearing from the reseller first. That there kinda really made me go hmmmmmm.....
[MTCB Android Head Units Q&A] KeiserSozeyFr:
lukesan :

I get it very quick : ordered on may 7, received may 15 !

In fact, my unit, for the moment is on my desk, with a computer power supply. I am playing with for the moment before putting it on my car.

I put it quickly just to see all is working ok, like proximity sensor etc ...

My car is VW golf 6 and all the connectors are not compatible:

- Antenna is not the same, have to buy an adapter

- Rear view camera is not compatible : input on the unit is CVBS (RCA), OEM camera is 5 wire RGB, I have to order a converter

I only found 1 RGB to CVBS adapter (be careful, there many converter for the opposite conversion) :

h t t p : / / w w w .aliexpress.com/item/High-Quality-26-PIN-RGB-to-CVBS-RCA-Converter-for-Volkswagen-Facotry-Camera-VW-Original-Camera/1737938580.html

I checked GPS from my desk ! accuracy is 0 meters and signal is found very quickly.

I cannot say if FM reception is good as I was not able to test it because of the connector incompatibility.

I don't know how to do a screenshot on this device.

Anyone know how to use the front panel next / prev buttons with another music player like google play music ?
[MTCB Android Head Units Q&A] uncleg:
I used it before, and sometimes has usb issues, but on very rare occasions.

Now I'm on official FW KGL 4.2.2 build 30102014 + 2.09 MCU and sometimes got usb issues.

And I'm not using Bluetooth ODB. But all android 4.2.2 have no any issues with bluetooth obd.
[MTCB Android Head Units Q&A] ultradj83:
Well, mine has.

It gets connected to adapter but no data is received.

I need to disconnect and reconnect a lot of times to make it work.

Just got a new adapter, I'll test it asap.

Thanks a lot for your help.
[MTCB Android Head Units Q&A] ktibor69:
Is this app working with iGo?
[MTCB Android Head Units Q&A] herdy33:
hi ..

I have a head unit like this, the brand pumpkin, hardware and software seem exactly the same ...

I want to ask for help, when the head unit is powered from the off state (the car key in the lock position) all applications running in the background can walk normally automatically, such as Car Service, Mobile Counter Pro, Real Time Tracker 2.

but when the head unit is turned back from standby, all applications that do not run again automatically, so I had to turn his back service manually. and when it is turned on back from standby, always appearing warnings were "unfortunately com.google.process.location process has stopped"

does anyone have a solution for this problem?

thank you before for your help

sorry if my english is bad, i use google translate
[MTCB Android Head Units Q&A] obekende:
Hi folks, its possible change the laucher on 4.2.2 JB for this 4.4 KK in my system? or for only 4.4 kk? http://xdaforums.com/showpost.php?p=57108718&postcount=5513

B, regards
[MTCB Android Head Units Q&A] ultradj83:
You're free to install any launcher as for any Android device.
[MTCB Android Head Units Q&A] agentdr8:
Works with mine, both iGo and Barasoft iGo.
[MTCB Android Head Units Q&A] OneCheekyDevil:
I have the same problem too. Both 4.22 and 4.4 androids. Even tried different MCUs. Problem exists for both home router and mobile hotspot.

Connection is initially Strong, then during a download the connection slows down to a halt and signal drops to very weak.
[MTCB Android Head Units Q&A] MasterPrenium:
What do you want to do with that ? It seems it doesn't boost mic with others apps ...

By the way, guys, do you know why my camera image is reversed horizontally (right is left and left is right)? There is one settings in the "security driving" menu but it doesn't reverse the image, only drawing ...
[MTCB Android Head Units Q&A] pencilhead:
Enable GPS to be always on.

Hi,

I have KLD unit and it is very good so far.

Rooted and running "KLD_KitKat_800x480_141110_rooted_light_reparted_init.d_v3"

I have 2 small issues with the GPS.

I would like to be able to run navigation app in the background (iGO Primo) and still be able to hear voice commands.

Whenever I push IGO to background, I get a "GPS Signal Lost" message.

Is there a way to keep the GPS running when navigation app is running in background, so that I can still hear voice commands?

The other issue is that TTS voice volume is very low compared with the radio.

I have not been able to find a way to boost TTS voice volumes. If I switch to NON-TTS voice mixer volumes are good between radio and navigation.

Any help is greatly appreciated
[MTCB Android Head Units Q&A] angusc:
To get i-GO to run in background use the home button at top right corner or drag down the notification bar to switch apps and still have them running in background. If you use the hardware key it shutdown the navigation (as defined by the "lost satellite connection" message. It's same if you want to pay Bluetooth music and navigate at the same time.