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Huifei 4.4.4 problem with bluetooth echo on other line

When I use my iphone 6 to make bluetooth calls via the HU
the person on the other line hear's their own voice echoing through their phone. I've tried using 4 different mics, 2 external, the oem that came with the '06 e-class, and the internal that came with the HU--but all have the same issue. Is there a setting or software/app that can fix this? It's been driving me nuts and basically makes the bluetooth phone talk useless in the car--I've even tried putting the car speaker volume on the lowest setting and problem still persists for the person on the other line.
Thanks for your help.
p.s. my headunit is a Huifei 4.4.4 kitkat quad-core with 16gb drive and 1gb ram. I am running the OS that came with the unit.

Check out this thread for a work around.. While it is not an easy fix, it may help.. I have yet to donit myself as I also have unuseable Bluetooth going due to to low internal Mike.. I haven't even tried the external that came with the unit..but am planning on giving the fix a try as at the moment I can't use handsfree
http://forum.xda-developers.com/showthread.php?t=3246277

Hi thanks for the link. Wow though, that's quite involved and I'm not electronically savvy to pull that off. Pulling the HU apart, soldering, wiring, re-wiring.
I wonder if there is a way to get bluetooth via a parrot interface but have it still interact with the HU?

Bluetooth Voice echo
I a same similar model Joying QuadCore K1366,4.4.4 kitkat, 1024*600. Many callers have told me that the ECHO is extremely sharp tone and annoying. I've look every where with no easy solution.

Got the same system as op and have obtained an updated ROM from the manufacturer which made an insignificant difference. This is a common issue with these units and don't trust myself doing the hardware fix. Tried several external mics with no "joy in" improving it.

Android Headunit for Hyundai I30 GDH (2015) - car integration

Iam having a look at some of the units for my 2015 Hyundai i30 cw. Namely two variants both with this features:
- 1024 resolution screen
- adapted to hyundai design
- quad core processor
Example for variant A
aliexpress.com/item/2din-Car-Radio-GPS-Navigation-Ipod-MP3-Bluetooth-USB-Capacitive-Touchscreen-Map-WIFi-on-Android-4/1889240271.html?ws_ab_test=searchweb201556_2,searchweb201644_0_79_78_77_82_80_62,searchweb201560_1
Example for variant B
aliexpress.com/item/1024-600-Quad-Core-2-din-7-Android-4-4-Car-Stereo-Radio-dvd-gps-for/32517997140.html?ws_ab_test=searchweb201556_2,searchweb201644_0_79_78_77_82_80_62,searchweb201560_1
Question
- Is there a way to use the car build in microphone with one of this units. If so how?
- Do you have one of those units? What is your feedback?

pr10dr said:
Iam having a look at some of the units for my 2015 Hyundai i30 cw. Namely two variants both with this features:
- 1024 resolution screen
- adapted to hyundai design
- quad core processor
Example for variant A
aliexpress.com/item/2din-Car-Radio-GPS-Navigation-Ipod-MP3-Bluetooth-USB-Capacitive-Touchscreen-Map-WIFi-on-Android-4/1889240271.html?ws_ab_test=searchweb201556_2,searchweb201644_0_79_78_77_82_80_62,searchweb201560_1
Example for variant B
aliexpress.com/item/1024-600-Quad-Core-2-din-7-Android-4-4-Car-Stereo-Radio-dvd-gps-for/32517997140.html?ws_ab_test=searchweb201556_2,searchweb201644_0_79_78_77_82_80_62,searchweb201560_1
Question
- Is there a way to use the car build in microphone with one of this units. If so how?
- Do you have one of those units? What is your feedback?
Click to expand...
Click to collapse
I can answer for I40 and the only way to get a descent Bluetooth is to modify the HU according
to the specific thread in this forum. Both HU's carry the same problem.
Be careful when you order to get the correct screen ie. 1024. They sometimes specify it as optional.
Also verify if you have a factory amplifier. If you have, you need another loom and an analog/SPDIF box.
They are cheap compared to the big guy's, so don't expect miracles. They still work.
I've four units for different cars similar to yours.

Can you point out the thread with the HU modification that improves Bluetooth?
The original Hyundai amplifier only takes spdif as an input? Intresting i dont see other i30 owners which use an android HU mention that.
You are right on the optional 1024 (usually extra 25$).
Iam most intrested not in the bluetooth mobile -> head unit connection but more in getting the audio from the original mic (just above the drivers head) connected to the HU. I feel this way i have less of the aftermarked look (additional mic) and also better audio since the original mic is pretty much in the perfect spot.
I guess i can solder whatever connection the original mic has to my headunit. But there might electrical issues or the mic cable be part of some strange car bus system which will it make hard to figure outand connect.

I don't have a hyundai, but I've put aftermarket units in 2 different cars w/ mics and both had the same problem - they are active mics that have noise cancelling & can't be used w/ these HUs. BUT, you can still easily disconnect the microphone from where it is located and put the aftermarket external mic in its place. My car is a 2014 mazda 6, and my OEM mic was in my overhead where my dome lights are. The panel was held in by 2 screws where the sunglasses drop down. I drop those 2 screws, disconnect the mic from its connector, and pull the mic out (it had some weak adhesive around it, very easy to take out). I then ran my external mic up my a-pillar and mounted it exactly where my factory mic was located. Sound quality is very good, everyone can still hear me okay. and everything looks stock.
Just buy a unit w/o BT issues (avoid MTCB units unless they have fixed this... others seem okay).

Are the units in my original post MTCB units?
What is the reason the active noise canceling microphones can not be used?

pr10dr said:
Are the units in my original post MTCB units?
What is the reason the active noise canceling microphones can not be used?
Click to expand...
Click to collapse
I didn't check your links so you'll have to check for yourself. An active mic will need to be powered, so you'll need to know the correct voltage and supply it somehow. I doubt it's 12V that you can use directly from the unit but you never know. Read it with a meter.
I guess theoretically you could make it work in that case.
Sent from my HTC One M8 using Tapatalk

New Android Head Units from Pyle

Pyle has recently released a few head units running 4.4.4 Kitkat. From the Amazon description:
Android OS Computer:
Touchscreen 'Tablet-Style' Functionality
Smart Device MirrorLink/AirPlay Support
Processor: Quad Core 1.6 Ghz Cortex A9
OS Version: Android 4.4.4 (KitKat)
It also indicates "Unlock Tablet-Style functionality." I'm assuming this means it comes rooted.
While Pyle is not known as the paragon of quality, they appear to be the first brand with a US presence offering an Android HU. Since their other HUs appear to follow the US DIN standard these could have the advantage of fitting in one of the readily available dash kits.
Here are the two I found on Amazon:
[amazon dot com]/dp/B01BECUOTE/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=S75ZYKYU5U3C&coliid=I25LAEC05MZLFW
[amazon dot com]/Pyle-PLDNAND621-Touchscreen-Navigation-Bluetooth/dp/B01BECUKD4/ref=pd_sim_sbs_422_1?ie=UTF8&dpID=51uMnRpESgL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1A4EM6W90HKY19XFNMQA_

how much RAM? I wonder where/how it was engineered? The biggest issue w/ these chinese HUs is the poor engineering standards. One of the biggest examples being the internal/external mic wired in parallel on joying/pumpkin HUs. This issue has been around for well over a year now, and despite pumping out new models they still haven't fixed this glaring issue.
To add to that, the whole MCU concept, and the fact that the BT is effectively de-coupled from the core system.
What I'd gladly pay $500 or so for (possibly more) -
- high quality DAC/pre-outs
- no MCU
- parrot BT FULLY INTEGRATED into the OS
- proper internal/external mic interaction
- octacore
- 2GB RAM
- android 5.0. Honestly not that big of a deal if the OS is stable and runs all the standard apps
- fully mappable/customizeable hotkeys for launching custom apps from SWC/physical buttons
That would be nice. I'd sacrifice my car custom plug & play HU with a standard double din w/ those features in a heartbeat. The glaring engineering flaws in all of these current android HUs is frustrating. But I live w/ it b/c it's still a nice upgrade over stock.

Hisma said:
how much RAM? I wonder where/how it was engineered? The biggest issue w/ these chinese HUs is the poor engineering standards. One of the biggest examples being the internal/external mic wired in parallel on joying/pumpkin HUs. This issue has been around for well over a year now, and despite pumping out new models they still haven't fixed this glaring issue.
To add to that, the whole MCU concept, and the fact that the BT is effectively de-coupled from the core system.
What I'd gladly pay $500 or so for (possibly more) -
- high quality DAC/pre-outs
- no MCU
- parrot BT FULLY INTEGRATED into the OS
- proper internal/external mic interaction
- octacore
- 2GB RAM
- android 5.0. Honestly not that big of a deal if the OS is stable and runs all the standard apps
- fully mappable/customizeable hotkeys for launching custom apps from SWC/physical buttons
That would be nice. I'd sacrifice my car custom plug & play HU with a standard double din w/ those features in a heartbeat. The glaring engineering flaws in all of these current android HUs is frustrating. But I live w/ it b/c it's still a nice upgrade over stock.
Click to expand...
Click to collapse
Closest I've seen is the in-dash.net unit which is octacore with android 5.1 coming sometime this year, (allegedly). The MCU issue is unfortunately unavoidable at least until Google adds native bluetooth HFP into AOSP, which isn't likely to happen. And even then you still need something to be the go-between control of the amplifiers, LCD brightness control, etc.
I have the octacore in-dash.net unit and it's pretty good. My biggest beef is with the bluetooth handling. The interface is fairly basic. I think one thing that these units need is their own 'contacts' and 'dialer' apps that can dial via the bluetooth service but that also interacts with my google contacts, google maps, phone links, etc so that I don't have to do the contacts sharing, or copy and paste phone numbers from web searches or maps searches. I've got the feeling that that is easier said than done but it is key in my mind.
This is my first android HU so I'm not super familiar with the mic issues that seem to plague them. My external mic seems to just be really quiet pickup. I was thinking of getting a little pre-amp for it to put in between the plug and the HU. Perhaps I should do some more research first?
I have just been using the built in amp so far. Was thinking about testing the pre-outs on this unit. I suppose I could just break it down and take a look at the components to see if I can determine what DAC is being used.
Oh, also I don't have SWC in my car but this unit is setup for them. Not sure the physical interface specifically as I didn't purchase that option but the mapping is all in the "vehicle interface settings" app on the unit.

Not all of these head units have the mic problem. But joying & pumpkin, which are two of the most popular models, do have this problem. I used to have a joying, now I have a 2nd gen AN-21U, and it doesn't have the mic problem.
Yes the ability to fully integrate our phones with google now via the HU would be perfect. Google now has all my contacts as I have an android phone and save my contacts to google. But trying to call a number this way goes nowhere. Really a way to make the whole experience as hands free as possible would be great. Ford has sync, mazda has gracenote, and there are others I'm sure that attempt to implement a fully hands free system.
Other users have already examined the DAC in these units. One made an audio mod that integrates the DAC directly with the unit instead of passing it through the MCU, which significantly improves the unit's audio capabilities. It's just another example of the head sctatching engineering decisions on these things.
more info here - http://forum.xda-developers.com/android-auto/mtcb-hardware-development/mtc-sound-controlling-bd37xxx-sound-t3234660
Btw I am not sure if there is a universal pre-out configuration for these, but my AN-21U has 1V unshielded pre-outs. Pretty frustrating. I get some "white noise" in the background when I up the volume thanks to the high noise floor. Considering putting in some high quality RCA cables to see if that helps, but obviously if the pre-out voltage was higher this would be less of an issue.

Pyle PLDNAND621
I 've bought and been using one of these for about a week now and had a couple questions for you guys. This radio seems to have an app for controlling the Bluetooth function and is not controlled within the settings menus. Do you think think the app could be changed as a Bluetooth obd2 module I use with other Android device works fine with the same car. I have the same question for the radio tuner app, I don't like the layout and it won't tell me the song titles . I search but can't find a "local station" radio tuner app.
Thanks for any ideas, Doug

I've got it and rooted it on 4.4.4 su etc ...flash fire enabled.....anyone point me to someone that could walk me thru dumping the rom on this unit and someone that can then make a custom recovery we would be in the game for this unit ..it has a recovery ..all I can say for right now .....v4a apk will not work on this unit due to some busy box error I cant stop ..I have it correct in the system ....so we need custom.rom.for it .....any one still wanna rip this thing?

lokisyn said:
I've got it and rooted it on 4.4.4 su etc ...flash fire enabled.....anyone point me to someone that could walk me thru dumping the rom on this unit and someone that can then make a custom recovery we would be in the game for this unit ..it has a recovery ..all I can say for right now .....v4a apk will not work on this unit due to some busy box error I cant stop ..I have it correct in the system ....so we need custom.rom.for it .....any one still wanna rip this thing?
Click to expand...
Click to collapse
Please help. I upgraded my PYLE PLDNANDVR 695 and lost bluetooth. Pyle wants me to send it in for repair. I much rather fixing this myself.

Setup/install question

So jumped in with out doing enough research.. I just installed one of the double din android units in my car. I was able to get everything wired up and running. But not much is working well.
I got this unit
GCS APEX ANDROID HEAD UNIT W/ GPS - 2015+ WRX / 2015+ STI
Android Operating System Version: 5.1.1
Processor: 1.6Ghz Cortex A9 Quad Core
Memory: 1GB RAM, 16GB flash
Stereo Power: 4x50W
So the unit itself seems very slow. I installed 2 apps. Spotify and Waze. The apps take a long time to load/open.
Spotify. Ok this is odd but not sure if its normal. I open spotify and I have the HU paired with my hotspot. It loads and starts to play but the sound is awful. I am not able to control anything via the headunit for sound such as fader/balance/eq. They don't do anything. Now if i open spotify from my phone and cast it to the HU i have all those controls and it sounds 100x better but the volume can be adjust from the phone and have to set that low. Is that normal? I have tried to get the USB to work and it will charge my phone (iphone 7+) but the headunit won't recognize the phone at all. don't even give me an option to use it via usb. I can also connect via bluetooth and stream that way but its similar where I can adjust volume from the phone. Sorry if this is really n00bish but thinking maybe its a setting? I can't seem to find anything.
After doing some reading i guess the 1gb was not the way to go but stuck for now. so any suggestions? I just want to be able to use Waze, and spotify and have the unit respond. When I click a button the delay is not a second or two but over 50 seconds and seems like it just crashes. I clear the memory and dont' have any live wallpapers running just nothing seems to be responding at all
Hope this makes sense and or someone might be able to give me some insight. Thanks for any help.
I can't post the link to the actual unit since I don't have enough street cred with the forum yet.

Any thoughts?

radio
My radio has the same specs as yours apart from the android version (4.4.2), i can confirm that Spotify and waze are both up and running within a second or two.
It does sound like you might have a faulty unit, is it possible to return it ?
You could also try a different rom but will kill any warranty I guess.

Yah that is what i am worried about. The vendor is not so eager to exchange it. I am going to take some video of what I am talking about maybe that will add some detail. Maybe someone will see it and point out that I might be doing something wrong. Not sure but very frustrating.
boss126 said:
My radio has the same specs as yours apart from the android version (4.4.2), i can confirm that Spotify and waze are both up and running within a second or two.
It does sound like you might have a faulty unit, is it possible to return it ?
You could also try a different rom but will kill any warranty I guess.
Click to expand...
Click to collapse

thedru13 said:
Any thoughts?
Click to expand...
Click to collapse
If yours is a MTCB/C unit (check the MCU version, it should start with this either MTCB or MTCC) you can flash a 4.4 ROM.
I also received my unit with 5.1 and downgraded to 4.4.

So tried a bunch of things over the weekend. No luck. I did do a factory restore and then was not able to even log into the play store at all. Google services kept crashing. I tried all the trouble shooting I could find online with no luck. Also I was not able to get the USB connection to see my iPhone. I could plug in a thumb drive and it worked fine. Are these just not able to use an iPhone at all? Not sure if anyone has been able to get the USB connection working between headunit and iPhone.
I sent the unit back hopefully getting a replacement to continue to try and get it to work. If not guess I will look for something else.

Seicane S6920 (Android 7 head unit) microphone and antenna issues

Hi everyone, I tried searching, I'm very sorry if I missed it. The one we have is the typical quad core, 16GB storage / 2GB RAM unit with Android 7.1 pre-installed, running on a PX3.
We just installed this last week, and we love it, but we have a couple of issues.
I have a microphone wrinkle that seems different than other posts. I don't use the mic much, and right now, I don't want to install an external. The mic clearly works for the bluetooth phone dialer (I put my phone outside the car to verify that the head unit mic was being used), but I get nothing at all for any other app (OK Google, OK Waze, a voice recorder app I downloaded to test, etc).
There had been mention in threads I searched of going into the factory settings menus / independent volume levels, but I see menu options only for adjusting volume levels to speakers (radio, apps, etc), but nothing for the mic. And obviously it's not zeroed out because it works with the bluetooth dialer. I asked the seller (Seicane) and they are looking into it. Any thoughts? Just to be clear, again, I just want to know about getting the internal one seen for other apps (mostly to be able to use OK Google), I know there are options to splice in an external mic... and we'll cross that when we come to it.
Also, we installed into my 2010 VW Eos... has anyone connected the VW diversity antenna lead to this stereo, can you recommend the right adapter, since this is the only piece that does not seem to have been included with the head unit that we need?
The only other thing I'm trying to figure out right now is how to stop it from going to a hazard icon (because I don't have a backup cam) whenever I go into reverse. It sounds like what I need to do is root the device and delete the APK for the reverse cam, or else it sounds like cutting a wire is also an option, I just haven't tried either, yet.
Thank you for looking!

i have a Seicane, 2 actually, the older 6.0 unit and the newer 7.1.2 unit with PX3:
https://youtu.be/MWVsNWZjeCQ
You shouldn't have to splice anything for an external mic? Did it not come with one? there should be a hole to plug in? That being said, I have not tested it without the external mic, but I definitely can get OK Google to work with the External Mic. Next time I take it apart, I'll try the internal only.
as far as the backup came, did you look in Extra Settings? or Factory Settings? I do have a backup cam, so I want it on, but I think there is an option to turn that off somewhere.
Edit to add - I also started a Seicane subreddit:
https://www.reddit.com/r/Seicane/

CadillacMike said:
You shouldn't have to splice anything for an external mic? Did it not come with one? there should be a hole to plug in? That being said, I have not tested it without the external mic, but I definitely can get OK Google to work with the External Mic. Next time I take it apart, I'll try the internal only.
Click to expand...
Click to collapse
Hi, I'm sorry, external radio antenna (not mic). The car has something that looks like maybe a twin FAKRA connector? The adapter that attaches to the back of the head unit is supplied for antenna, but it doesn't match that... I see things that look like they might fit on Amazon, though, going to order one ASAP and give it a try.
as far as the backup came, did you look in Extra Settings? or Factory Settings? I do have a backup cam, so I want it on, but I think there is an option to turn that off somewhere.
Click to expand...
Click to collapse
Hmmm, I might be missing which setting controls this, there doesn't seem to be one related that I can find, although what some of them do seems kind of counterintuitive.
I'm going to go check out your subreddit! Thanks!

The Seicane will included an AM/FM radio adapter for regular radio, but I already had the Metra 40-EU10 Antenna to Radio Adapter:
http://amzn.to/2y2pJln
That one is Jeep specific, is that what you are looking for?

CadillacMike said:
That one is Jeep specific, is that what you are looking for?
Click to expand...
Click to collapse
Thank you, we went back in and looked more closely. So it turns out my Eos actually has three different antenna systems, and the stock radio connected to them all in a diversity arrangement and switched between them as needed, apparently. One of them has a single Fakra connector (what plugs into the piece you posted), which is what we plugged into (except that we missed plugging the power wire back into the wiring harness to the CANBUS), but I found several posts related to other head units that said that the other pair of antennas, that are in a twin Fakra connector (two of those plugs side by side) actually works better (but it sounds like it isn't possible to use them all at the same time). So the next step will be to order an adapter from the twin Fakra to the plug on the head unit (sorry, I haven't hit ten posts so I can't link it) and in the meantime I'll see if the missing power wire makes things any better, it sounds like I was using the antenna that I was using, unpowered, when it's supposed to be a powered antenna....
Sent from my Lenovo YB1-X90F using Tapatalk

One more update from me. I missed this fairly large thread about the microphone issue, which seems to not have a known fix, yet:
https://forum.xda-developers.com/showthread.php?t=3694314
Sent from my Lenovo YB1-X90F using Tapatalk

I just read all of that. Those are for XRC, I think my Seicane is a KSP