yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] Us-Marshal:
I guess it would be possible that it could be an issue with the amp. Do you have anything else in line between the deck and the amp - line a crossover or eq?

Also, another thought - wonder if the sub is going out. Maybe the voice coil is partly shorted. This could display itself in (almost) no sound until the voltage increased enough to overcome the short. This may explain the poor/scratchy sound too.

Take a digital volt meter and measure the impedance of the sub (disconnected from the amp). The impedance should be very close to the nominal value of the sub (2, 4, 8 ohms). If it's close to zero, it's bad.
[MTCB Android Head Units Q&A] freetacos4everyone:
Just got one, so excited!

Just received my Ouko 4.2 android unit and after getting everything setup I ran into a rather strange snag; when using the subwoofer RCA/Composite out it will disable all the speakers hooked directly up to the unit.

I feel like this is an easy fix but I couldn't for the life of me figure it out. It's either I have only a sub, or only the 4 cab speakers.
[MTCB Android Head Units Q&A] RyanBRZ:
Nothing else in line.

I'll check the sub. Ugh that scares me.

The sub is a sundown audio sa12 which handles a ton of power. Rated at 600 watts...I'm running it @ 1000 watts at 1 ohm . people run them at 1500+ all day.
[MTCB Android Head Units Q&A] Us-Marshal:
That's a nice sub for sure. At 1 ohm, I assume that's a dual voice coil 2 ohm that you have wired in parallel. Check each voice coil separately and they should be virtually identical.

One more possibility, albeit remote, is that you have one of the voice coils wired backward. When this is done the signals cancel, but can produce sound at high voltages.

Good luck.
[MTCB Android Head Units Q&A] RyanBRZ:
This sub config/setup has been running with no issues for over a year. The recent change is I am now running everything straight from the hu to amps. Previously I ran from hu to powered crossover to sub amp. I did this to compensate for low output from low level outputs. I also was running fronts/rears from hu internal amp (front/rear amp is new) so I had to have the sub gain high to match what the front and rears were outputting. This was running completely fine on Friday, this kind of came out of no where.

I really don't think it's my sub but I'm going to check anyway. I want to use a different output source, other then hu, to see how it plays. Just ordered a 3.5mm headphone to rca plug so I can play from my phone to test this.
[MTCB Android Head Units Q&A] encryptedslayer:
some working progress.

alright guys so I finally got torque working. I downgraded to an official firmware using JY_V_2.11_(20141125) and torque worked on the first try running on 4.2.2 and v2.11 MCU. I am not rooted ATM.

So I am guessing my MCU after I updated was causing issues.

I updated from 4.4.2 to 4.4.4 with v2.12 and torque was not happy. I now have some remaining questions.

1. what are the biggest differences between 4.2.2 and 4.4.4?

2. I do not have android devices other then this one, so im guessing a launcher is for theme changing? what do you guys recommend?

3. is anyone running 4.4.4 with zero problems using torque?

4. is rooting only for allowing the swap of firmware?

5. i was running 4.4.2 and had zero issues with torque until i updated to 4.4.4. any guesses what happened.

6. why does my unit have a TV hard button when i don't even have a TV antenna input lol.

thank you guys for your support, i mainly post my issues so people can learn off of them.
[MTCB Android Head Units Q&A] Delecron:
Thanks for the post, do you have any pictures of you're handy work? I'd actually throw a tip in the jar for that...

Also, has anyone figure out how to make the bt module pause whatever is playing during a call. Listening to audiobooks sucks when after taking a call you realize it's moved 2 chapters.

Thanks again!
[MTCB Android Head Units Q&A] Navall_75:
I'm having a strange issue with mine, Using any KGL MCU above 1.86 stops my cars remote central locking from working till the unit has fully shut down. My unit is from here http://www.75andzt.com and is known as a Navall 2. any ideas on how to solve this?
[MTCB Android Head Units Q&A] ga!nusha:
+1 for JetAudio. Also, the internal amplifiers/filters are not bad at all.

Viper is not working with MCU apps (Radio for example).
[MTCB Android Head Units Q&A] fedmond31:
JY random start troubles

Hello , i have a JY in my Toyota since last December , I might be conservative but I run it since beginning, with MCU 2.11 and Coudu KK 4.4.2.

It was working quite well that’s why I didn’t update yet.

I understand that unit start with last open apps, in my case it is always radio and IGO Nav with Bluetooth and wifi on.

Since a while, I have some funny random things after boot:

Sometimes IGO would not start, sometimes Radio would not, sometimes Bluetooth would not.

Also, but more seldom, on system settings the GPS sound mode becomes greyed and therefore IGO always mute Radio immediatly.

But sometimes it starts all well !!

I cant figure myself where this problem comes from ? Can somebody help ?

Many thanks
[MTCB Android Head Units Q&A] DJCannonball:
i have spinning logos at boot all the time. it's mostly after the OS crashed, then reboot and never get to complete 1 single reboot ever after.

i have trouble since i got my unit. in my case pretty sure it's a heating problem.

---------- Post added at 01:55 PM ---------- Previous post was at 01:39 PM ----------

wow, i've been off this thread for 3 days. there's another 12 pages added.

i've been struggling with my crashing unit ever since.

i'm absolutely sure my unit is crashing due overheating.

as i already told in the past posts i've tried every possible firmware (KLD, KGL JY al lof them) including the latest stock firmware i got from my seller. also various KLD mcu.

ALL of them crash my unit at some time.

i did some heavy testing the past 3 days.. i drove lots kms plenty of time to test.

last friday morning, i stepped into my car. off to work. turned the unit on music plays fine (not any other app used).

after 1 hour driving i got to my work parking lot and turned everything off.

in the afternoon after work i was going home. (my car was parked in the sun that day)

i turned the unit on. it couldn't even finnish booting and crashed. the logo stopped spinning before it was finnished booting.

hard reset (tiny reset button) doesn't help

i turned on the airconditioning, and set it to 'Freeze-yer-nuts-off'

in the meanwhile i kept trying to reboot the unit.

after 2 minutes or so of trying.. the unit could finnish booting again and began to work again.

so, i'm absolute sure this is heat related.

please note that the muisc player is the ONLY app i've used the past 3 days. so Waze or Syic have nothing to do with the crashing, but i take it will charge the cpu with more load. and the higher the cpu-load, the faster the cpu-temperature will raise.

i've asked my seller for advise.
[MTCB Android Head Units Q&A] Siffion:
You say you've tried every firmware but not which version jellybean kitkat etc.

I'd goback and install a jellybean rom to start and maybe rollback your MCU to its original version test for a few days without installing any apps then when happy update either a MCU or rom but not both at the same time till you encounter problems Again
[MTCB Android Head Units Q&A] DJCannonball:
i wonder if your read the lines i typed about the car being parked in the sun, and almost instand crashes etc? i didn't get to reboot with all the heat in the car.

after turning on the aitconditioning set to 'Freeze-yer-nuts-off' reboot began to work i can use the unit again.

i have very little faith that flashing an old firmware like Jellybean will solve this. but i will try it out to test.

note that i'm already on stock's firmware and stock mcu v 2.20

update: there doesn't seem to be any firmware Jellybean 4.2 available for KLD with 1024 x 600 resolution screen. i can't test that out.
[MTCB Android Head Units Q&A] devilsoft:
This is a known issue of these devices. On the first page, on ISSUES paragraph, you will find this:

- Unit might not boot on very hot conditions as it has a thermostate to avoid possible problems. It will work normally when cooled down.

Maybe there is a workarround to disable or fix that thermostate.
[MTCB Android Head Units Q&A] DJCannonball:
The conditions were not very hot. They were just hot. 23 degrees. Celcius or so.

And second, how do I fix a thermostate of unit that is brand new And still has warranty?
[MTCB Android Head Units Q&A] devilsoft:
I have no idea, I just tried to help you find the reason why that happends. You can ask some electrician to help you, or you can ask the factory to provide some guides.

Even if it's 23 degrees, if the car is exposed to the sun for a time, the temperature increases inside the car, so the thermostat detects a high temperature.

We don't know how high needs to be, for the thermostat lock the boot.
[MTCB Android Head Units Q&A] ga!nusha:
Don't forget that the CPU has no radiator at all. It gets way hotter than you think. If inside the car you have 50°C than it is surely a heating problem.

Perhaps a cpu radiator can be a solution ? I know that it helps a lot on tablets...
[MTCB Android Head Units Q&A] jimsiv:
Mine it works fine at 23 degrees but the radio doesn't. When the weather is cold is fine but at 16 degrees and more I haven't got any reception. I ask the seller if he can help me by sending me an fm module to solder it myself but he doesn't respond. Do you guys know where i can buy an fm card to solder it myself? I have a Kld mcu and the manufacturer is Kianda Electronics (I think he is just a reseller) I tried also an fm amplifier but didn't help.
[MTCB Android Head Units Q&A] DJCannonball:
Don't get me wrong, I appreciate any help[emoji4]

I've been electrian myself, i'd be happy to place a fan inside the chassis and place heatsink on the cpu, but opening up the unit would void warrenty.

I'm still waiting what my seller has to say
[MTCB Android Head Units Q&A] 4stimpy:
Siffion, would you mind sharing which usb webcamyou are using?

I am also searching for a cam to use as a dash cam.

I think a wide angle is preferred.
[MTCB Android Head Units Q&A] agentdr8:
I use two things to ease input: 1) Disable Fullscreen keyboard xposed module, and 2) Geyes Mini Folding Wired USB Keyboard (the linked one is similar). It fits nicely in my glovebox and easy enough to unfold and connect if I need to tap out a long-winded email, or to do work via Terminal on the headunit itself.

I don't believe it can affect any audio streams other than Android. So no Radio, DVD, Aux, iPod.

It does this by default if you use the stock MTC-apps (Music, Radio, DVD, etc). MicrontekServer (MTCManager) watches for btLock, which is a boolean that gets set whenever a phonecall is active. It broadcasts an intent com.microntek.bootcheck, with a string extra named class that's set to phonecallin, and this gets received by all MTC-apps, which in turn pause/mute the current audio stream.

Some audio players such as Poweramp have a setting to pause music/playback on audio focus loss. For others that don't, they would have to either implement a receiver for the above-mentioned broadcast (unlikely), or there would need to be a service running that monitors for this broadcast, and sends commands to the audio apps to pause them.
[MTCB Android Head Units Q&A] eastberkshirecustoms:
Hello everyone, new to the forum...I just bout a KGL-7302 a few weeks ago. with spec.'s : MTCB-KGL4-V2.22, running KK 4.44. I have successfully flashed it with Coudu's rom to have root. I have read hundreds and hundreds of pages on this thread. Lots of good info and discussions. I do have many questions, but the first is pertaining to the Verizon Message+ App. I installed from the play store, but it will not open on the HU. Well, it opens but immediately closes. Anyone know what's going on or a workaround? Thanks.
[MTCB Android Head Units Q&A] agentdr8:
Sounds like the app is crashing. Try watching logcat (either via app, or via terminal emulator) while launching Message+ and see if it shows any pertinent crash info.
[MTCB Android Head Units Q&A] Nyehehe:
I understand the Superuser apk part, which I installed and then it says: "The Superuser binary (su) must be updated. Please choose an installation method. Recovery mode installation is recommended for HTC devices." I have 2 options: Cancel and Recovery Install. Pressing the Recovery Install gives me this message: "There was an error installing Superuser. Please send a log of the error to the developer."

I bought this HU, not from this site, but from eBay totally the same: http://www.carjoying.com/2-din-car-...rt-obd-wifi-1080p-steering-wheel-control.html

MCU is JY V2.44 and I updated only the firmware.

What am I supposed to do to get root on this device?

Root Checker says: "Sorry! Root access is not properly installed on this device. Current device: rk30sdk Android version: 4.4.4"

Unfortunately the eBay seller has disappeared today, so I can't ask for any help there.

Thank you in advance for the answer!
[MTCB Android Head Units Q&A] agentdr8:
You can't root the stock 4.4+ roms with any apps; you have to install a pre-rooted system image, as outlined on the first post of this thread.

If you get asked to update the su binary, you can't pick the option to use TWRP unless you've flashed the TWRP recovery from a rooted system image first. Even then I don't know if that method works.
[MTCB Android Head Units Q&A] BrownHP800:
Bluetooth loses connection after a couple days

I have a rooted KLD. The unit always connects to my OBDII but at times it will not connect to my Galaxy S4. I tell the phone to connect and it will connect and it works for a couple of days. It will boot right up connect to the phone and all is good. After 2-3 days it will not connect to the phone until I go to the phone and tell it to connect to the head unit again. Not a huge deal but slightly annoying. Not sure if its the phone or the head unit.
[MTCB Android Head Units Q&A] typos1:
Viper is complex but it is worth trying as it makes and ENORMOUS difference to the sound quality. I would wait til youve read a good few reviews about the Pioneer units, their last Android attempt was not very good and now where near as good as this units, despite their foibles.

Did you actually read the thread title at all ? Your are in the wrong thread, unsurprisingly the thread for Ouku units has "Ouku" in it.

The reason BT is done this way is because Android has no capability to control another phone via BT, only the internal phone and I m sure you d moan if you had to take the SIM out of your phone and stick it in the head unit. I ve never had a problem with it connecting to my phone.

Interesting, if you read the thread yourll see that BT OBD did not work at all.with 4.4.2, it ONLY works with 4.2.2 or 4.4.4. A small minority of people have had problems with BT OBD on 4.4.4 but I think they sorted them in the end (use the thread search to find out), so strange that youve got it working on 4.2.2.

1) There are no BT/MCU issues. 2) Look at screenshots of 4.2.2 and 4.4.4 to see the differences, or use thread search to find out. 3)A launcher is a homescreen app , it is not for theme changing. 4) Everyone is running 4.4.4 with Torque and no problems, some with BT/OBD some with USB/OBD ( which is fsater and more secure). 5 see above. 6) You didnt pay for a TV card.

As I said Viper DOES work on MTCMusic !!

It maybe heat but you have done NOTHING to confirm it, nothing that you have said proves it is heat at all.

Running music will not overload the CPU. The only way to check is either to dismantle your unit and feel the CPU or maybe see if there is a CPU temperature app so you can see what the temperature ACTUALLY is rather than just surmising.

It is not so much an issue, just a warning that there is an internal thermostat, I cant remember reading about a unit that suffered from heat problems, in fact one guy in the UAE reported it working fine if 40+degC !
[MTCB Android Head Units Q&A] doctorman:
I am in the process of reading the posts since Nov 2014 and that has taking me forever and I know how to search but I could use a hand here please...

got my new JY unit android 4.4.4 MCU : MTCB-JY-V2.18

it is OEM fit to 2008 Toyota Highlander.

2008 Highlander has 2 Radio antennas a bigger one and a smaller one

I have a poor radio reception

is there an AMp or power connection that is needed for this car or is there a way to utilize both antennas?
[MTCB Android Head Units Q&A] typos1:
Google about how to fit an aftermarket system to your car - fitting these units is the same for any other aftermarket stereo and a Toyota forum is likely to have all the info you need for you specific model and how to wire up the antenna.
[MTCB Android Head Units Q&A] agentdr8:
Looks like a diversity antenna setup. I think Metra makes adapters that utilize both antennas into a single Motorola plug (the larger of the two), for use with aftermarket headunits.
[MTCB Android Head Units Q&A] DJCannonball:
let me remind you that my unit just 2 weeks old and has warranty.

I am EAGER to pop da hood of my unit and place a fan and a heatsink, but that would BREAK WARRANTY!

besides, i have proven it's a heat issue already. as i said, there is a relationship in time between turning the unit on and point of crashing.

when it's cold weather, it takes 40 to 100 minutes before crashing (only using music-player)

but when the weather is getting more warm like 23 degrees celius. after turning on the unit it only takes about 10 or 20 seconds to crash, it even couldn't finnish booting proper.

and there's another thing: when i set the airconditioner to 'freeze-yer-nuts-off' the unit begins to work again.

now.. how much more proof do you want ??

there's another thing: you mentioned about the unit having a thermostat which prevents the unit from booting when the temperature is too high.

here's a little movie i made, this is how it looks when my unit crashes, it can not be rebooted any more unless i turn on the airconditioning

https://www.youtube.com/watch?v=k4dW2KHpNp8

as you can see the screen fades to complete white very slowly. i take it that is not the thermonstate preventing the unit from booting.

i hope this clears things up and get things straight.
[MTCB Android Head Units Q&A] ga!nusha:
I was just saying that it doesn't work with MCU controlled apps like radio, dvd, ipod. It indeed does work with MTC Music.

Like you said, Viper is a MUST. The sound difference is enormous . I think we should point it out more in the first post!
[MTCB Android Head Units Q&A] DJCannonball:
just a little update about the heating issue: my seller is contacting their engineer to consult the issue

keep you posted
[MTCB Android Head Units Q&A] Karanso:
I have excactly the same Problem, my phone Motorola G 4G
[MTCB Android Head Units Q&A] typos1:
As I said, you may be right but nothing you have done confirms it, you either need to pop the hood and feel/put a thermometer on the CPU or install an app that reports CPU temp. Until you do one of these things its simply a theory.

---------- Post added at 11:30 AM ---------- Previous post was at 11:24 AM ----------

This is the THIRD time I have suggested that you install a CPU temp app to PROVE whether it is overheating or not !!

How is an engineer in China gonna be able to tell, you reckon hes gonna have a thermometer several thousand kms long ?? !!

---------- Post added at 11:31 AM ---------- Previous post was at 11:30 AM ----------

Pm Pakidermo and ask him to add it to the first page.
[MTCB Android Head Units Q&A] DJCannonball:
This is the THIRD time i'm telling you: opening up th HU would BREAK WARRANTY!!

if you paid 450 dollars for a piece of electronics that fails, you would not open it up and void warranty. you would listen to whatever your seller has to say and sort it out.

i am NOT opening my HU up until my seller says so. I proposed my seller to open it up and install a heatsink on the cpu and fan inside the chasis myself.

just have a little more patience
[MTCB Android Head Units Q&A] ga!nusha:
LOL. Why would you need to open up your HU to install an application ?

This one shows all temperature sensors it can find: https://play.google.com/store/apps/details?id=com.cpuid.cpu_z
[MTCB Android Head Units Q&A] cuboy29:
I just ordered these for the same issue in my Toyota Sienna.

Scosche Mda-B Micro/Delco Antenna Adapter Tip

Metra 40-UV43 Male to Female Motorola Antenna Cable
[MTCB Android Head Units Q&A] madjeff:
I just purchased the exact same model (Seller was Auto Pumpkin) and received it a few days ago. Currently there's no known way (that I'm aware) to root the stock 4.4 rom, only flashing one of the pre-rooted 4.4 roms such as Couda's.

You may want to hold off rooting for a few days. I hooked up and tested the unit out of the box and everything worked perfectly. I then rooted using Couda's 4.4 JY ROM and am now having a few issues such as odd radio behavior and my OBD connector not working after working perfectly with the stock rom. I'm sure I need to tweak some things, but you may want to wait a few days since I've already commited to root and can be your guinea pig. =)
[MTCB Android Head Units Q&A] denal4o:
JY - V2.16 Problem

Hi guys,

I would like to share my experience with my JY HU.

HU: MTCB-JY-V2.16

Model: 9813H

Android ver. 4.4.4_08122014

I bought the unit 3 months ago. Install it immediately and everything works fine until i installed rear view camera.

Was a bit hard to make it work ""properly". After that randomly I start getting the boot screen. than radio continue playing music but no touch screen or buttons working. Everything is frozen. If I press power button music stops and the only thing I can do to have it back working is to reset it via pin button which while driving is a hustle and annoying.

removed the camera but the problem still exist.

recently installed JY_4.4.4_1024x600_141208_rooted_light_reparted_init.d_v4.2

and updated MCU with the same version 2.16 - Nothing.

I've already started thinking there is a problem with the hardware of the unit.

Appreciate any idea.

Thank you!
[MTCB Android Head Units Q&A] CARRisma:
So I've purchased the bits to get USB working correctly on my HU - a externally powered USB hub and a 12v->5V DC converter. I've hit another hurdle. It's currently not possible to connect my USB hub (Dynamode USB-H40-A2.0) to the DC converter. The USB hub uses a 3 pin plug (standard UK power plug) and the DC converter has a female USB socket. I've tried emailing Dynamode but the emails bounce back saying their mailboxes are full - maybe they've gone bust? If I knew the exact name of the cylindrical plug which plugs into the USB hub, maybe I could find a suitable cable on eBay / Amazon, but there are many which look very similar so want to avoid wasting money on the wrong item. So how have others with similar setups gone about connecting them up?
[MTCB Android Head Units Q&A] CARRisma:
I did wonder about that. But also wondered if it had to be powered via the dedicated round DC socket. Thanks, I'll give that a go.
[MTCB Android Head Units Q&A] agentdr8:
Hack off the standard UK power plug, and connect the wires to a male usb connector on pins 1 (positive) and 4 (ground).