yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] ktibor69:
I asked the manufacturer and they gave me good solution for next/previous swapping issue.

This solution works for JY HU with Ford Mondeo MK4.

I think if you choose good cable of the car streering wheel port, the solution will be working all HU and CAR.

Their answer was:

First you need to find the red and white line and KEY2 line on the power line

Then please according to the picture to link, linking them together, I hope this can solve your problem!

[IMG="JY solution"]http://kepfeltoltes.hu/150330/SWC_solving_www.kepfeltoltes.hu_.jpg[/IMG]

I made the soldering:

[IMG="I made"]http://kepfeltoltes.hu/150908/Key2_connect_www.kepfeltoltes.hu_.jpg[/IMG]

[IMG="JY connection"]http://kepfeltoltes.hu/150908/JY_connection_www.kepfeltoltes.hu_.jpg[/IMG]

The red-white cable goes to the car steering wheel port. I checked it. Very important: You have to know your car PINOUT and you have to find the steering wheel pin..

This solution works fine on my HU. I can use steering wheel app now.
[MTCB Android Head Units Q&A] getehem:
JUst a picture photoshopped by a chinese guy who doesn't know english..

I changed the picture on the website.

---------- Post added at 06:59 PM ---------- Previous post was at 06:44 PM ----------

I guess this connection diagram for Huifei units can be useful here....
[MTCB Android Head Units Q&A] Valaran:
Hi ! I got a critical issue on My rk3188 4.4 unit. Two times already My unit started with a message saying it wipe all data. Next reboot the unit is stock ! All apps and settings removed. Dont know what happen. Stock rom with root enabled. No exposed or custom apk/trick.

Any advice ?

Thanks in advance. I'm on holiday with almost no network and it's a pain to redownload apps like gps.
[MTCB Android Head Units Q&A] mrky01:
yes, i did. thanks
[MTCB Android Head Units Q&A] kruuth:
Anything on the external USB wifi?Is there maybe an app that lets you manipulate this?
[MTCB Android Head Units Q&A] doctorman:
I work as a re-seller of JY units, drop me a PM and I will see if I can get you a better pricing if you want.

shipping country

car year and model
[MTCB Android Head Units Q&A] javlada:
I have a CAN decoder, but I don't know how it is connected from the decoder to my Headunit. But because I have to set CAN to "No", I believe that the decoder transforms the messages directly to some cables from the HU.

Anyway I upgraded to the latest ROM from September and problem is gone now. My steering wheel controls work again.
[MTCB Android Head Units Q&A] ownerpredator:
Something missing?

Hi, I have download and install it on my android car stereo.

I have entered the codes from next and previous but when I opened spotify it does nothing. I have also enabled spotify support on the service but still the same.

Am i missing something?
[MTCB Android Head Units Q&A] obekende:
Hi Folks! any news from Andoid L?

Regards
[MTCB Android Head Units Q&A] jordanow:
Thank you for this really useful topic!
[MTCB Android Head Units Q&A] Acampbell:
I have a jy radio in the VW Variant, and I am about to install a backup camera that requires a reverse signal. This is where I got lost on the install. On the sheet of paper I got with the radio it states to strip the orange wire and connect it to the "Reverse +", is this an actual reverse sense wire as in where i would attach the wire on the camera with the same name, " reverse +" or do both of these need to go to the reverse light? Does anyone know what the actual function is on this wire? I'm not sure if its pulling a reverse signal over canbus or not.
[MTCB Android Head Units Q&A] Telemachus:
From testing my JY unit, the moment a +12V signal is applied to the reverse lead on the radio, the MCU changes the screen to the video that is being sent in through the backup camera RCA cable. This appears to be independent of any of the Android system, as it functions even while Adroid is still booting.

Therefore, you would want to attach this to the signal that turns on the "reverse" lights in the back of your car.

The Camera will also get its power (+12V) from the same source, although likely from the trailer hitch or reverse lights, whereas the head unit will get the signal from your wiring harness (if you are lucky enough to have one there) or you will have to run a wire to the reverse signal under the dash.

Now the dimming feature is a mystery to me. I have a dimming knob in my truck, and the old factory radio responded to it, but my JY unit does nothing with it.
[MTCB Android Head Units Q&A] Acampbell:
Thank you
[MTCB Android Head Units Q&A] alexmyron:
How to have FM Radio play during bootup. Joying 7" quad core 4.4.4 unit

I can't seem to find this anywhere...

Is my Joying 7" Quad core 4.4.4 unit capable of playing the FM Radio during bootup?

It is pure android and doesn't have anything in the settings.

Thanks In Advance!
[MTCB Android Head Units Q&A] Malaysk:
I did the firmware for RK3188 800X480 and and put it in the net, and then turned on kernel firmware 1024X600!!!! What do they think manufacturers JY ?????????????????????????????????? I am very upset.
[MTCB Android Head Units Q&A] doctorman:
Issue is reported..

thank you
[MTCB Android Head Units Q&A] Valaran:
Is it possible to make an update from USB instead of GPS card slot ?

Nobody for My factory reset bug ? :(
[MTCB Android Head Units Q&A] Telemachus:
It certainly works on my RK3188 JY.

I haven't had much luck with it autodetecting the firmware/MCU files, so I just go into recovery. There is an option there to do it from USB.
[MTCB Android Head Units Q&A] grahamwright1:
No, the Radio, Music and Video functionality is not available until it has finished booting up unfortuantely.
[MTCB Android Head Units Q&A] rlivin:
This is the right place to ask but i am about to purchase. Which radio should i get?
[MTCB Android Head Units Q&A] RubbedLung:
So would that enable me to plug USB cables into them? If so, where would I find something like that?
[MTCB Android Head Units Q&A] krustymk:
I have reverse sensors(radar) fitted to my car (not factory), is there a way of hooking this up with the radio?

The car symbol comes up on the screen when in reverse.

Thanks for looking :)
[MTCB Android Head Units Q&A] halloj:
Have no idea, maybe from a scrapped car. I made mine up myself. You have to look inside to get the colors right. The different

standards are here: http://www.usbpinout.net/
[MTCB Android Head Units Q&A] Telemachus:
Working Google Voice Search APK

I see posts as far back as March 2015 detailing problems with the google search crashing. Most of them just refer to a "previous" apk that worked well with these units.

Does anyone by chance have a link to such APK? Or is there some other workaround to the constant Google Search crashes? I get everything from "stopped responding" to "microphone error." Once in every 10 times will actually work.
[MTCB Android Head Units Q&A] halloj:
Have you been in to settings/apps and cleared data and also the cache section concerning Google search?

If not, do that and it might help you to a fresh start. It helped me.
[MTCB Android Head Units Q&A] Telemachus:
Certainly worth trying, I suppose. I just freshly wiped everything and put on the newest Malaysk ROM, and then wiped again. I'll keep wiping, LOL.:D

I am a newb with these units, only had mine for 4 days.

That having been said, it is pretty clear from the wiki that the answer to your question is quite simply: Whatever you can get from a trusted source that fits your needs. Despite the look of the unit, or the "manufacturer" there are really only a few options: RK3066 (dual core) or RK3188 (cuad core). The price between the two is minimal, so I say, get the quadcore! Also, there are two resolution options: 800x600 or 1024 x 768. Again, I say get the better resolution.

Now, what could be up for debate, is which MCU to get. That, I have not seen a clear answer to. Is there really that much of a difference from one MCU to another?
[MTCB Android Head Units Q&A] boarKV:
Working under 4.4.4 working nice, thanx Walda
[MTCB Android Head Units Q&A] fabien_m2002:
http://xdaforums.com/showpost.php?p=61880159&postcount=15993

http://www.apkmirror.com/apk/google...arch-3-6-16-1614640-arm-android-apk-download/
[MTCB Android Head Units Q&A] obekende:
Hi DSA

You're building for RK3066 800x480 KLD in red interface?

regards
[MTCB Android Head Units Q&A] Telemachus:
Thanks, bud.

Is this a problem that only some people face (google search not working) or is it widespread? I notice the custom ROMS all come with the newest version of google search, where I would suspect they would include this APK if this is a universal problem.
[MTCB Android Head Units Q&A] Brendo:
Pretty sure there is a setting in the app that you can tick if you are getting crashes. I'd assume it's common if that is the case. It has been posted previously
[MTCB Android Head Units Q&A] SPACSYSTEM:
I do not know if I will talk something stupid, but for those who understand, certainly it will not be anything stupid.

Before I have my current radio (Pumpkin android 4.4.4), I had one with android 2.3 from RoadRover .

It turns out to adjust the brightness had two functions:

If I had the car's headlights turned off the radio buttons lights off (such as pumpkin), but if I called the car's headlights, radio buttons also linked (like pumpkin).

Happens is that was a double feature to adjust the brightness of the screen, fitted with headlights turned off to maximum brightness, and to adjust for vision at night linked the headlights and made the adjustment.

So when I had the headlights the car off, the screen with the brightness at the screen are in maximum, and when connecting the lights of the car (at night or in a tunnel), had the brightness of the screen at minimum. So, always I had an automatic brightness adjustment in the unit.

I suppose that this function was configured on the MCU, but only those who understand is that can confirm.

Someone wants the Firmware and MCU from Roadrover to see if can create something for our KGL radios / Klyde / Roadmaster / GS / JY / MD ?
[MTCB Android Head Units Q&A] ImitableBeatle:
That definitely sounds doable. And please don't forget the HA units as well :thumbup: :D
[MTCB Android Head Units Q&A] SPACSYSTEM:
ImitableBeatle, I can not make changes to the data of the MCU, but it can be anyone here who knows, can do something. :D
[MTCB Android Head Units Q&A] Telemachus:
I have read about such a setting a few times...

So an option within the app (that you can't even open because it FC's) that tells it to stop crashing so that you can open it?

Maybe if it was April 1st, for Windows based device, I could see that happening...

:(
[MTCB Android Head Units Q&A] Brendo:
#15648

You'll need the pro version of secure settings. Worth a try
[MTCB Android Head Units Q&A] fabianosan:
Please, help me!

Hi guys,

I'm looking for the firmware for RK3066 800x480 with KLD MCU that looks like the screens above.

My unit is an Witson W2-A7037 with MCU version: "MTCB-KLD-V2.30" (01/22/15) and firmware version number is "rk3066-eng4.4.4 23012015.15:44:05.

Can anyone help me?

Thanks in advanced.
[MTCB Android Head Units Q&A] doctorman:
regarding the ROM that was not working

Joyous has responded :

updated the September 3rd, JY RK3188 800x480 ROM

http://www.carjoying.com/Joying-blog/12.html
[MTCB Android Head Units Q&A] Acampbell:
This is a very technical question so hopefully someone can help me. Is it possible to replace the TDA7388 audio chip with something better. Maybe something with a THD much lower than 10%¿
[MTCB Android Head Units Q&A] fabien_m2002:
Hello,

i fact it's not surprising that manufacters include last version of apps for simplicity reasons and also in China they cannot test Google apps.

Furthermore, i faced same issue in my ex car unit Parro smart. Voice search was crashing very often and i had to install a specific version to fix the issue.

I guess it's same here but for now i did not test the apk i linked to you.
[MTCB Android Head Units Q&A] anpo:
I have an AN-21 U headunit right now (here looking for an update, probably hit the button within a day or so) which works pretty much like your old device. In AN-21 U setting you can configure whether buttons should follow headlights or stay on all the time. That's good but not nearly good enough so what I learned in AN-21 U forum is to set buttons to always on (if that's not doable here you may just shortcut a 12+V to the appropriate wire) and download Twilight from Google Play. Twilight will adjust your screen brightness based upon clock and sunrise/sunset in your GPS position. Might require root, don't really know for sure, I've never had an Android device without :cool:
[MTCB Android Head Units Q&A] :
Yes you can. I changed to a TDA7850 and it was better and more durable as it's also 2 ohm stable which I needed. There are others that are pin compatible as well.

Gesendet mit Rauchzeichen von unterwegs
[MTCB Android Head Units Q&A] lisches:
Hi,

I use the Malaysk Rome from 13.08 . As a navigation app I use Navigon Select . Unfortunately, Navigon does not really work , and always lose orientation . With the Stock Rom Navigon works without problems , someone has an idea why?

Unfortunately, I can not picture post because I have to make sure only 10 posts ...
[MTCB Android Head Units Q&A] chipyy94:
Its hard to change it? And do u must change something in software or you can just play music after installation and how much it cost you ? :)

And is this real specifications of tda7850? if it is then its 45W stronger then 7388( link):

Datasheets	TDA7850

Product Photos	25-FLEXIWATT SERIES

Other Related Documents	TDA7850 View All Specifications

Standard Package ?	17

Category	Integrated Circuits (ICs)

Family	Linear - Amplifiers - Audio

Series	-

Packaging ?	Tube ?

Type	Class AB

Output Type	4-Channel (Quad)

Max Output Power x Channels @ Load	85W x 4 @ 2 Ohm

Voltage - Supply	8 V ~ 18 V

Features	Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type	Through Hole

Supplier Device Package	25-Flexiwatt

Package / Case	25-Flexiwatt (bent and staggered leads)
[MTCB Android Head Units Q&A] jrgalang:
Hi all, in need of a replacement LCD screen and I fear the unit's seller is asking me to purchase 4 micro SD cards totaling 50 USD instead of the agreed 35 USD price. Can they really adjust the price after I make the purchase in AliExpress? If not, can anyone refer me to someone who I can possibly buy parts from? Here's the details of my current LCD screen set:

XianChuang Display 7" 1024x600 (152x85mm) connected to a KGL-TFT-90D-1024-V3.4 board.

Serial number from the main LCD housing:

M070WSP40-02A/150327 / 23155

Serial number from the ribbon that connects to the unit's board:

MF0701684004B
[MTCB Android Head Units Q&A] 2safe4you:
HuiFei - 2 DIN Pure Android 4.2.2/4.4.2/4.4.4 RK3066/RK3188 CarStereo Radio H...

Hi,

i have the same Problem.

Navigon Select or Navigon Europe.

Routing no Problem. But in the way he loose the orientation and Talk Not to me.

I checked with a Special App to Write a Track from the Car Unit GPS. I compare it with a Outdoor GPS from Garmin.

A Perfect Track. Normaly He Must know where he is.

Other Apps work in the Car Unit.

Gesendet von iPhone mit Tapatalk

I use the original Firmware from June
[MTCB Android Head Units Q&A] doctorman:
I reported your problem to car joying and carjoying said they fixed and reuploaded it yesterday,

are you saying you re-downloaded it recently and it is still not working?
[MTCB Android Head Units Q&A] Malaysk:
NEW from September 9, 2015

Only for RK3188 800X480

+++ Android base on August 25, 2015

+++ Many,many other fixes and additions.

Download

Special message for beginners now !! Before experimenting with firmware, Check to make first of all that you can to get to the factory firmware recovery standard methods and if something goes wrong, you will be able to return to their firmware.
[MTCB Android Head Units Q&A] :
No it was quite easy to solder even without much practice. Its a hardware mod only, no software adjustments needed. Just cut all wires from the chip and remove every remaining pin on its own. Clean the holes, insert the new IC and solder it and you're done!

I had to change, as my amp IC got killed 1 day after delivery. I didn't even change the input capacitors, which should be 2200µF instead of ~470µF in the orignal TDA7388. I have to admit I didn't find where those caps should be located on my KGL5 PCB. It works and as I push it to only 30-40% of the max. volume. as this is what is felt as really loud before the speakers start to sound bad. Good luck and please report your success afterwards. It helps others. :)
[MTCB Android Head Units Q&A] 7floor:
Hello, I have a JOYING version of head unit on RK3188 chip, and I have exact problem like you.

My unit does not preserve date and time over reboots.

The important thing is that it does not need to be a power cycle when +12V disappear for some reason.

The date/time is not preserved after reboot when power is connected for sure, ignition is ON and if you wish, the engine is running.

There are many ways to reboot the device. For example, I use reboot function found in Xposed Framework.

So this makes me think that it is something not related to unexpected power loss, but some kind of software issue, or software/hardware incompatibility maybe.

I asked on Russian 4pda forum, and two people replied that they do not have the issue, i.e. their date/time is not getting reset over reboots.

I'm curious what can be done here...
[MTCB Android Head Units Q&A] RichyE:
Thanks for the great work.

The download finished under 5 minutes.

Will try it tonight when I drive home.

Does this include your modded MTC (Radio & Music) files?

Update: sorry. I see in your screenshot that you have added them already.

Thanks
[MTCB Android Head Units Q&A] Mat.:
Hello everybody !

Sorry for the Google translation

I would like to modify the images of the radio MTCradio.apk to get this. (It's a simulation)

My problems are:

The pictures are not real size, they are smaller and it is the xml which forces their sizes

It is possible to put them in the real sizes and to rewrite the xml ?

The 6 buttons of selection of stations is only a single image.

On my project the 3 buttons of the top are different of the 3 buttons under

Is it possible to realize ?

Merci beaucoup !!
[MTCB Android Head Units Q&A] shadowfoxmi:
I resolved the issue I had with the date time getting reset. I think this problem is unique to BMW e90s. The power wire in the connector that used to connect to the OEM radio head unit goes to sleep afte 20-30 mins after key off. The original radio didn't keep time so it didn't matter then. Now with new android radio head units, I don't think there is any battery like laptops do to preserve time so it relies on some always ON power line to keep date and time.

So I ended up disconnecting the power line that goes to sleep and replaced it with another one from the fuse box that is always on. It's very easy to find and do. I ended up using power from the fuse that supports the door lock module as they have to be always on and ready to be locked/unlocked. I can help with the procedure if you would like. Hope that helps.
[MTCB Android Head Units Q&A] fabien_m2002:
Hello,

you have to swap red and yellow cables to your battery:)
[MTCB Android Head Units Q&A] nixfu:
Q:Is Malaysk having some problems with the latest September updates for the quad core?

It seems like only the dual core/800 firmware has been released and he has updated it a couple of times. I thought I read some problems with the quad core having the wrong files or something.

Is this going to make it so a September update for the quad core will not be possible?

---------- Post added at 04:51 PM ---------- Previous post was at 04:49 PM ----------

Yes the red cable has to be connected to an ALWAYS on power source. Without having an always on power source, it will lose the time, and lose the radio presets I think. From the testing I did on my bench the units will draw about 4-5 milliamps when they are in off/sleep mode so there is no real danger of draining the car battery or anything.
[MTCB Android Head Units Q&A] chipyy94:
I will order this chip cuz its very cheap :) so you say that now if u set volume to 30-40% is so loud that speakers are crunching?
[MTCB Android Head Units Q&A] Malaysk:
NEW September 9, 2015 for 1024X600

Only for RK3188

+++ Android base on August 28, 2015

+++ +++ Many,many other fixes and additions.

Download

For those who are not satisfied or dissatisfied with a set of programs that you have something does not work, you are not forced to Use of the firmware and you can install alternative firmware. And whatever you do, you do at your own risk.
[MTCB Android Head Units Q&A] Tha_Stig:
Stupid question Malaysk. Can I update my current version with the update firmware button from your previous ROM?
[MTCB Android Head Units Q&A] Malaysk:
This button updates made Chinese programmers and the previous firmware to mine it was not working.
[MTCB Android Head Units Q&A] PAPPAFRITAS:
September 9 firmware

Could you upload it for 1024x600 ?

I'm lookin foward testing it!
[MTCB Android Head Units Q&A] doroyce05:
I have the GS and just installed the Malay dual core 800x240.

Where do I go to edit the buttons available on the notification bar? Is this from xposed?
[MTCB Android Head Units Q&A] Telemachus:
Thanks,

I tried that version of Google, and it still crashes. I either get "cannot connect to microphone" or "google has stopped working." I have tried stock Joying Rom, Malaysk with and without Next launcher. I have wiped the cache from google, and have done a factory reset.

I even tried that secure settings Pro app, or whatever it is. Checking the FIX UI button did nothing.

It seems like somehow it crashes trying to connect to the microphone. Is the microphone connection handled by the MCU, or is it purely android? I haven't tried a different MCU file yet.

I am happy with how my JY unit is working, but the lack of Google voice control is almost a deal killer for this thing! Maybe my unit is defective?
[MTCB Android Head Units Q&A] fabien_m2002:
Pity it doesn't work.

I do agree, vocal search in a must have in a car head unit. I cannot believe that it's not possible to call someone with a vocal command :(

I tried to use google now but no phone is recognized.