yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] agentdr8:
As long as the recovery partition is still intact, flashing kernels shouldn't affect the ability to restore a whole update image if things go sideways. Back in the day (4.2.2 for those that remember), flashing alternate kernels was one way to get wifi working after installing updated firmware that borked the wifi support. Of course those weren't modified kernel images, so I have no idea if they're signed or go through validation checks.

I think the worst thing that would happen is you get stuck in a bootloop or a boot hang. Reboot to recovery, flash an update.img and you should be good to go. Just make sure you have the proper recovery image installed (stock, not twrp) prior to mucking around.
[MTCB Android Head Units Q&A] sunripe:
Do not want to pressure, but any plans for 3066 1024x600?. Thanks
[MTCB Android Head Units Q&A] idr3s:
Yep ... thats true! Better if its fixed..

Anyhow..will be back here when I get mine delivered..

Gl with getting yours fixd aswell
[MTCB Android Head Units Q&A] dark alex:
a frequency depending on the motors RPM inducted into the PreOuts so you have a constant noise in the background which changes its frequency with your speed... in German we call it "Lichtmaschinenpfeifen" (alternators whistle) or spoken in slang "Akustischer Drehzahlmesser" (acoustic tachometer)
[MTCB Android Head Units Q&A] 5TARKAN:
understood. this phenomena is well known in car audio, especially with analog amps. there are two main reasons for it:

1. amp power cables and signal cables (rca) are wired too close to each other. solution is to reroute the cables.

2. connection of the gnd cable to the car chassis of the amp and the headunit are too far from each other, causing a balancing current in the shield of the rca cable. solution is to connect hu and amp gnd at a common point.

so both issues are not really linked to the built quality of the hu

edit:

3. check if shield connection (outer ring of the rca connector) to gnd is done properly on both sides (hu and amp). i have seen hu and amps of lousy quality not having this connection properly done.
[MTCB Android Head Units Q&A] dark alex:
already checked everything
[MTCB Android Head Units Q&A] 5TARKAN:
if all the above points are done correct and can be excluded as the root cause, it will unfortunately lead to some more complex troubleshooting...

it can be basically everything, from defective components within hu or amp, quality and routing of cables ending up with the quality of the alternator (generating too much of harmonics, etc.)

the only way to find out would be to replace component by component and see what will change...
[MTCB Android Head Units Q&A] parazit26:
to everyone who has a universal unit. Did the unit fit in your double din bezel with no modification?

I ordered a couple double din bezels for my car, but the radio doesnt fit somehow.
[MTCB Android Head Units Q&A] xrapidx:
Mine has a 1mm gap on each side, but you can't see it.

It should fit through a bezel of 180mmx100m - the frame on the inside of your vehicle might be a different story.
[MTCB Android Head Units Q&A] parazit26:
thanks thats good know. the bezel i bought should be a double din bezel, but the dimension of the inner cut out is only 174mmx100mm and this is kinda strange to me
[MTCB Android Head Units Q&A] typos1:
There are 2 sizes of double DIN, 178mm and I think 174mm, there are more details in the AN21-Uthread I think.
[MTCB Android Head Units Q&A] coppertop2000:
The universal stereo is NOT a STANDARD DOUBLE DIN size similar to what you will find from Tier 1 manufacturers such as Pioneer, Kenwood, etc.

Tier 1 manufacturers make the faceplate section smaller than the chasis. They usually include a trim piece that can 'fill in' the faceplate sides so that they match the chasis edges (approx. 2-4 mm on each side).

Most dashkit manufacturers use the faceplate size to cut the opening so that you don't need to use the trim piece for a cleaner, more original look. The faceplate on the universal HueFei unit is the same size as the Tier 1 brands including the trim piece. So this extra 2-4 mm or so on each edge may be too big for most dash kits.

I had to do quite a bit of a shaving/sanding to get my universal double-din bezel to fit. I could see this being a problem depending on the actual design of your bezel. In the end, mine worked out fine. I could have done a cleaner job of 'shaving it down', but it's not terrible

Hope that explanation made sense.

---------- Post added at 11:31 AM ---------- Previous post was at 11:22 AM ----------

I had a similar problem in my car. Tried everything to get rid of the engine whine. My previous JVC double din didn't have any noise after similar trouble shooting. I spent literally hours trying to fix the issue with the HuiFei.

In the end, I gave up and ran speaker-level inputs into my amp. This solved my engine whine issue immediately. Given that the HuiFei doesn't have a crossover in the unit itself, it wasn't a huge deal. If your amplifier has this option, you could try that as an option.

If you're creative enough, you can use the existing RCA cables as 'speaker cables' to test if this can solve your problem. Then run speaker wires while removing the RCAs.
[MTCB Android Head Units Q&A] dark alex:
My HuiFei seems not to output frequencies below 100Hz fully via high level outputs... So my bass iss nearly gone...
[MTCB Android Head Units Q&A] coppertop2000:
I actually ran one set of RCA's for the sub off the HuiFei. The speaker level outputs from the headunit go to the amp for the FRONTS and REARS only, and then RCA's are used for the SUB channel. FYI, I am using a 5-channel amp.

I never thought about it...I assumed my front & rear speakers (crappy factory bose) were capped off at ~100Hz...but now that you mention it, it must be the stereo that is not outputting anything below ~100Hz from the speaker outputs. When I was running 3 sets of RCA cables, I had engine whine, but more low frequencies out of the front & rears. It's kind of stupid now that I think about it. In the end, the current solution is ok for me. The mids/highs auto capped at ~100Hz, and then subwoofers taking over for below 100Hz produces a pretty balanced sound...so I'm ok for now. Hopefully the output is software 'capped' and not hardware...although I fear the latter.
[MTCB Android Head Units Q&A] dark alex:
Well my Problem is I have a audison DSP in my car and have to choose eighter using HIGH or LOW level... Else I wold have to install adapter coponents... Don't really want to do that seriuosly...
[MTCB Android Head Units Q&A] tcfuk1962:
The Chinese made units are a slightly different size

Pioneer, Alpine, Sony, JVC, Kenwood, Panasonic etc) are 173x98mm.

Chinese units are 178x100mm.
[MTCB Android Head Units Q&A] agentdr8:
We call that alternator whine here in the States. Sometimes using a better ground (e.g. body instead of harness) fixes it. If that doesn't do it, they sell filters for the preouts that can reduce/eliminate it.
[MTCB Android Head Units Q&A] KeiserSozeyFr:
Did you try your new mic ? Do you have the same bug than me ?
[MTCB Android Head Units Q&A] agentdr8:
I didn't have a chance to pull the hu out last night. I'll hopefully get to it tonight and will let you know what I find.
[MTCB Android Head Units Q&A] xrapidx:
I'm also waiting to hear, still need to order one, my audio is crap
[MTCB Android Head Units Q&A] KeiserSozeyFr:
Ok, than you very much.
[MTCB Android Head Units Q&A] kwalsh24:
Anyone report this bug yet? The base and treble is mismarked in the amp adjustment
[MTCB Android Head Units Q&A] Malaysk:
I try in the terminal.

I do not have a factory firmware from new rekaveri for this unit

I have all the great changes. Here are the settings I made - in the screenshots
[MTCB Android Head Units Q&A] mimpoca:
I was trying to read through the most recent 100 pages of this monster thread, but I couldn't find the answer to my question, so please forgive me if this was mentioned before.

Does Tomtom work in Malaysk's most recent RK3066 1024x600 firmware from July 7,2015? I have a JY unit running 4.4.4 stock.

I also have another problem that I have not found an answer to. When the radio is on, the system volume is comparatively low, so that TTS voices are barely understandable. If I turn the radio off, then the system volumes suddenly becomes very loud, including the TTS voices. Turning the radio back on decreases the system volume again. This is very annoying. Does anyone know of a way to separately control the volumes, or to prevent the radio app from messing with the system volume? Perhaps an alternative radio app?

I tried to change the volumes in factory settings, but the impact is very limited. The main culprit is the radio app, I think. Any help will be appreciated.
[MTCB Android Head Units Q&A] Tha_Stig:
DUHHHH. THANK YOU! I must have had a brain fart, I should have seen this in the beginning. Was most likely tinkering too much in all the settings.

Keep up the amazing work!
[MTCB Android Head Units Q&A] dangaute4:
DVR wiring

Does anyone got the signal's on the pins or drawing of the DVR connector ?
[MTCB Android Head Units Q&A] Tutti-frutti:
I just got a RK3188 unit. It has a KGL mcu, and it came with v2.55.

I just tried upgrading it to one of darkleo's MCU with sound improvements. First thing I noticed that I needed to do the reset+power combination in order to get the unit bootable again.

However, after the update the hard buttons of my unit don't work anymore, and illumination colors are mapped incorrectly. I flashed the unmodded 2.55 again and all works fine now.

Is there any possibility to get the improved MCU from darkleo running on my unit?

Edit: Or can this be fixed by setting up the factory settings again after upgrading the MCU?

How it came out of the box:
[MTCB Android Head Units Q&A] Vierka:
spotify problem

Malaysk ROM for RK 3066. After updating startup builder do 2.0 it marks spotify as not installed. I tried reintsaling spotify without - still marked as not installed. When I add spotify to install recovery after boot it starts spotify but only the service not the main program and eventualy crashes. Other services/programs are ok. Any ideas how to fix it?
[MTCB Android Head Units Q&A] Marius B:
Hi Malaysk !

Can change news apps on red color.

I like news apps but i want in red .

Can help me ? I make and my self but i dont know how to decompiling apps.

Many thanks !
[MTCB Android Head Units Q&A] matrixddl:
Igo TTS has sound issues.

What are the values in factory settings sound? You can set Radio to 0 and system to 15 (10 is default).

Also put the amplifier to custom and set values to low. For Music use Poweramp where music volume can be set in app itself.
[MTCB Android Head Units Q&A] doctorman:
looking forward to 1024*600 for dual core update..

is there a way to update the recovery first so we dont lose data while updating firmware?
[MTCB Android Head Units Q&A] mimpoca:
Thank you for your reply. I installed a number of other TTS voices. It's not just iGo, it seems to be all of them, which makes be think that this is more a systematical problem, not one of just iGo.

I did already tried in factory settings to set radio to 0 and system to 20 (maximum). This made the TTS voices loud enough to be used while the radio is on. However, I accidentally turned off the radio during my tests and as soon as the next turn came along, my ears were almost blown away by the now super loud TTS voice.

The radio/system volume relation is being completely messed up by the radio app. :( It appears though that nobody else has the same problem. I only read about generallly low volumes of TTS with these HUs.

I will play a little bit more with the amplifier settings, but I don't have high hopes.
[MTCB Android Head Units Q&A] flexi1:
Same problem

got the same problem, but lets hope somone in her can find it :D
[MTCB Android Head Units Q&A] jorjake:
please guys! anyone ..... yer or no :d

thanks
[MTCB Android Head Units Q&A] tylerwatt12:
question.

Some cars pure android systems come with an adapter box, it has a port on one side and I assume converts something from the cars wiring to be compatible with the huifei stereos.

What is it called and what exactly does it do?
[MTCB Android Head Units Q&A] OneCheekyDevil:
At least we're getting somewhere to displaying custom images :D

Maybe the image's file type colour resolution is wrong (16bit/24bit/32bit colour?)

I can tell you i had the same issues with iGO too. Different TTS voices have different volumes. Even the PRO voices (Announcing street names) had a different volume.

First, go into the GPS settings on the HU, and check if you have the right GPS app selected, and then check whether you have mixing selected and set it's volume to the maximum.

I also read on another forum where in iGO's settings file, you can change which sound stream it can use to make the announcements (MEDIA / ALARM / RINGTONE). i have never managed to get it to work, but you can try on your unit.
[MTCB Android Head Units Q&A] pants001:
Based on your screenshot that looks to be a KLD R3188 with 1024 resolution?

Check the stats of your unit before you flash anything, take note of current MCU version especially

You can flash any Firmware for your chipset and Screen Resolution

Only flash the MCU from same version you currently have, ie KLD or KLD2 etc
[MTCB Android Head Units Q&A] Krisjan89:
hi dsa

i think post 8 in this link, could help you a little in regards to which parameters you have to be aware of.

http://freaktab.com/forum/tablet-su...not-bootanimation-in-900supersport-rom-u30gth

Best regards

Krisjan89
[MTCB Android Head Units Q&A] jorjake:
thanks

it worked like a charm, yes my device is a KLD2 MCU, 1024x600, rk3188.

i noticed that now a have a screen flickeringin in white/grey areas when i input text and in Google play.
[MTCB Android Head Units Q&A] Malaysk:
Service starts like nothing happens

Russian translation. View attachment values-ru.rar

And I would have corrected it activity_main.xml

<TextView android:textColor="#ff00ffff" android:gravity="center_vertical" android:id="@id/author" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="0.0px" android:layout_marginBottom="15.0px" android:layout_marginStart="15.0px" android:layout_marginEnd="15.0px" />
[MTCB Android Head Units Q&A] niru1978:
I had the same problem and didn't mess with the MCU ever. The gurus may help
[MTCB Android Head Units Q&A] pcoopmans:
You have to alter the settings in 'Factory settings'. The translation is a bit strange sometimes.
[MTCB Android Head Units Q&A] Marius B:
[MENTION=3744488]devilsoft[/MENTION] uita-te la eroarea asta . Apare cand am instalat v 2.0
[MTCB Android Head Units Q&A] devilsoft:
That error is when you try to update the script, and you have no internet connection.

---------- Post added at 09:55 AM ---------- Previous post was at 09:53 AM ----------

Thank you for the translation [MENTION=3590033]Malaysk[/MENTION]. Regarding the layout, using px is not adviced. I always use dp. I upload the v2.1 in a minute.

---------- Post added at 09:57 AM ---------- Previous post was at 09:55 AM ----------

Hmm, that root method I wasn't aware of until now, when you talked about it :) I need to see how can I implement it, after I see how that root method is done.
[MTCB Android Head Units Q&A] antvic:
When I bought my unit nor the GPS worked me. I checked the connector and me dí account that central wire was cut. I had to weld it and since then it works perfectly. It was a complicated job.
[MTCB Android Head Units Q&A] Navall_75:
I have 2 GPS antenna's and have tried both, when I put the latest MCU with Latest JY launcher it worked for about 2 days then no signal, I have tried everything and nothing seems to work.
[MTCB Android Head Units Q&A] 3xplora:
Malaysk, Tha_Stig

I think just switching Automatic Time Zone off is enough for the clock but there may still be an underlying issue (at least for me). I can set the time , date and zone manually (with GPS Auto time, Auto Date and Time, Auto Time Zone all off). The HU shows the correct time but GPS monitor shows Moscow time and displays many satellites with good signal on a northern hemisphere map ( I am south GMT +10 Australia) but no satellites in use.

Excellent work on the rom Malaysk. They make these head units a pleasure to use.
[MTCB Android Head Units Q&A] Malaysk:
originally with GPS Auto time, Auto Date and Time, Auto Time Zone all off and set its value time and time zone. Reboot the device. Then again, put everything in auto mode. It should be all right.
[MTCB Android Head Units Q&A] xrapidx:
GPS on mine has also got bad. Have to put the antenna on the dash with nothing in the way.
[MTCB Android Head Units Q&A] Navall_75:
Mine has always been mounted on the dash nothing blocking it, I put the spare antenna I have in every position I could even on the roof of my car and still no signal.
[MTCB Android Head Units Q&A] pinotuning:
ok my friend

I unpacked my original firmware ( KLD_RK3066_4.4.4_800x480_2015-05-22)

I fixed partition userata 3 Gigabyte and after

Updates from recovery !!

everything works well and memory to 3 gigabytes !!!!

good day
[MTCB Android Head Units Q&A] laandennis:
hy guys,

I'm new to this threat but I've got an eonon GA5150F (android 4.4) and I understand this is the right post but need root.

can somebody help me? (it will take me days to scan all the previous posts)
[MTCB Android Head Units Q&A] Malaysk:
So it is necessary to write in the terminal?

If so - then he writes nothing

ps startservice com.jetappfactory.jetaudioplus/.MediaPlaybackService
[MTCB Android Head Units Q&A] Navall_75:
I managed to get GPS signal at last but in order to do this I had to take the battery off the car (battery reset) I let the car stand without it's battery for about an hour and put it back in, booted the stereo and got signal. What would of cleared with a complete loss of power? Cache or memory? and how do I replicate this without having to remove the battery in future?
[MTCB Android Head Units Q&A] antvic:
Thank you for your excellent work, but could not upload your files to a faster server (Uploaded, etc.). See screenshot.
[MTCB Android Head Units Q&A] mrbean2k:
Hi Guys ,

Just got from my chineese supplier firmware and mcu updates for my KGL4 unit .

in case someone is interested follow the following links:

KGL_rk3188_h(20150708).7z :

http://fs.163.com/fs/display/?p=X-N...9DjNX-U6QIHnsGi3qBR0OAUdoz7vWug&title=updated

MTCB-KGL-V2.59 - copies .rar:

http://fs.163.com/fs/display/?p=X-N...t0C5l1ZtfOjUR3Z05TL096VTXoVF0Qw&title=updated
[MTCB Android Head Units Q&A] xrapidx:
Is the mcu chip and resolution dependant?
[MTCB Android Head Units Q&A] Malaysk:
Video - RK3066 - 800X480 - update_4_4_4_800X480_RK3066_26_MAL_NEXT_LAUNCHER

https://www.youtube.com/watch?v=NRhoIwE6We8
[MTCB Android Head Units Q&A] Marius B:
yes . check on about and see what mcu you have .

for resolution install some app for check .
[MTCB Android Head Units Q&A] Acampbell:
Is there a trick to getting Sygic Maps to work, Everytime i try to open the app it tries to set it up from the beginning as if i have never installed any maps. I have the paid version on the app and still can't get anywhere. I've tried searching and couldn't find any info. Malaysk, im loving your rom. Good work PM your paypal address and I will donate to you. I tried your link but couldn't read the language it was in. The other question I have is does anyone know how to get screen mirroring to work or the name of the app I would use? Thank you guys for all the help this thread has been very helpful.
[MTCB Android Head Units Q&A] Marius B:
Check on my link oem directory easyconnect app. this is app for mirroring.
[MTCB Android Head Units Q&A] CARRisma:
I assume you haven't got a 3G dongle connected. Sygic doesn't seem to work if it can't find a valid IMEI number.
[MTCB Android Head Units Q&A] Acampbell:
No, 3g dongle I use WiFi tethering from my phone. I tried using an imei changer and that didn't work either.
[MTCB Android Head Units Q&A] DWilks:
I'm also a satisfied customer of the Joying RK3188 unit and second that on great support from Rambo at support@carjoying.com. He's currently sending me a free reversing camera because the unit got slight damage in shipment via DHL. On East coast USA and gets here in 4 days!...that's fast free shipping!
[MTCB Android Head Units Q&A] RichyE:
Thanks, look great can't wait to play with it on my RK3188 800x480.

update: never mind below question as I see Malaysk already shared V2.67 on july 15th :)

I see that my MCU is KLD2 V2.67 but I see that the last version shared is V 2.64 for people to download.

Is there a way I can retrieve it from my unit and upload it to share on xda?
[MTCB Android Head Units Q&A] koimr:
I've dealt with Rambo as well and he's always been very informative and quick to respond. :) I will definitely order from them again.

---------- Post added at 02:49 PM ---------- Previous post was at 02:23 PM ----------

I followed the instructions in this post: http://xdaforums.com/showpost.php?p=61164396&postcount=13660

Use the Xposed IMEI changer, I seem to recall other ones not working.
[MTCB Android Head Units Q&A] brioschi:
try this:

http://xdaforums.com/showpost.php?p=61196412&postcount=13752

worked for me too :)
[MTCB Android Head Units Q&A] Acampbell:
Ill try that, thanks.
[MTCB Android Head Units Q&A] SilverViper2k:
Sounds like a gif to me. You could compare the first bytes with the following list:

https://en.m.wikipedia.org/wiki/List_of_file_signatures

Or google the first 4 hexadecimal letters...
[MTCB Android Head Units Q&A] kevant69:
[MENTION=3590033]Malaysk[/MENTION] Is the blue themed radio app in this video the one on the OP? The August firmware video.
[MTCB Android Head Units Q&A] goodboyz358:
Will a 3g 4g doggle work with rk3188????

Was thinking about ordering Verizon Pantech UML290VW
[MTCB Android Head Units Q&A] jorjake:
question

[MENTION=3590033]Malaysk[/MENTION]

hi,

this firmware (update_4_4_4_1024X600_6_RK3188_MAL_13_08_2015.rar) is the last firmware for us? or there is a newer one for KLD2 1024x600, rk3188?

thanks

---------- Post added at 03:57 AM ---------- Previous post was at 03:43 AM ----------

3G dongle works for sure, i use a Orange capable 4g+ dongle and does not work in 4g+ only 3g.
[MTCB Android Head Units Q&A] Malaysk:
Unfortunately it did not. You can ask your dealer? We will be grateful :good:

Many thanks. :highfive: Unfortunately I do not use screen mirroring to work or the name of the app and I can not say anything. I just do not know ;)

Sorry, I do not understand :(

Yes, this is the latest firmware (android base of 8 August)
[MTCB Android Head Units Q&A] Malaysk:
MCU KGL3 v.2.68
[MTCB Android Head Units Q&A] doctorman:
thanks

1024X600 for RK3066 is the only one that is not updated yet...

can I install the recovery first and then update the ROM so I do not lose the installed app and data?
[MTCB Android Head Units Q&A] Malaysk:
A where will you get a new recovery.img for your device? It may ask the new firmware from the seller and I immediately made a new firmware with new rekaveri?
[MTCB Android Head Units Q&A] 2kiki:
[MENTION=3590033]Malaysk[/MENTION], a big thanks for your previous work.

Can you upload MCU KGL5 v.2.68 if there
[MTCB Android Head Units Q&A] 3xplora:
Malaysk

GPS Info time shows correctly, thank you. Satellites are displayed with good level but still not 'in use'. This may be a GLONASS issue. My HU was purchased with GLONASS. With stock rom installed I get many satellites in use (all GLONASS).

I have rooted the stock rom and added Xposed framework and modules for now so I can investigate the GPS files structure. If I can't solve it I am certain I will go back to your rom.

Thank you again.