yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] semizark:
Guys what do you think about this devices sound quality ? does it even give out a moderate sound quality ?

Nowadays i'm planning to buy it. There is a new device with a lower price like 95usd, rearview camera included, (Forum doesnt let me send links since i dont have 10+ posts, the device is in Aliexpress website, its model name is RK A702)

The info given in the link is not clear but that device probably have a different kind of CPU, 1.6GHZ Dual core, possibly RK3066, Not RK3188.

And the device has a sound chip called TDA7388 which is produced by ST electronics brand. do you have any info about that chips sound quality ?

and What do you think about this device? Does it worth buy it instead of the Quad Core RK3188 processor model?
[MTCB Android Head Units Q&A] gmcmen:
Yes it does work

:good::good::good:

Thanks a million for the simple instructions on changing the Boot Animation.

Works 100%
[MTCB Android Head Units Q&A] xm32:
I was able to flash without a full system boot

Video on youtybe прошивка магнитолы RK-A701

For the firmware used usb on 2GB FAT32 in root firmware with 4pda. All removable media is extracted and everything turned out

Received a clean system both from the store
[MTCB Android Head Units Q&A] semizark:
Guys, please help me.

I want to buy this device.

But in the Chinese website, there are 2 devices looking exactly the same,

The only difference is the model number. One of them is the cheaper one RK-A702 and the other one is RK-A701

some of the selllers say that RK-A702 has Dual Core 1.6 GHz processor, and some of them says that it has Quad core 1.6 GHz (RK3188)

in order to avoid confusion, I would like to buy the expensive model RK-A701. But does it really have a RK3188 Quad core processor? Anybody, please confirm.
[MTCB Android Head Units Q&A] gmcmen:
Help needed

I installed "Car launcher" installation went good until I switched off the car and back on.

Now all I get is a black screen with the notification bar at the top, I can get into wifi and clock settings only.

Anyone know how to reset the unit or how to get my home screen back
[MTCB Android Head Units Q&A] xm32:
I think the firmware will help

How to flash write on two posts above

The firmware is on 4pda (links I can not attach yet) firmware yadi.sk/d/AVfRNclF3FYnQe
[MTCB Android Head Units Q&A] dtrain123:
You previously used my method to change the boot animation so you should have USB debugging still turned on?

If so you can connect to the device using adb (like I described in the boot animation instructions) and run the command:

adb shell

am start -n com.android.launcher/com.android.launcher2.Launcher

This should start the original launcher application and you can uninstall the new launcher from there.
[MTCB Android Head Units Q&A] gmcmen:
I fixed it.

All that I had done was install the "Car launcher" app, open it and add a few shortcuts.

I then turned off the car and back on to test it and ended up with the black screen, with the notification bar at the top.

This is how I fixed it,

I guessed that the Car Launcher app had messed up the "home launcher" and I found a "Home switcher" app in the Play Store on my PC.

On my windows PC,

I logged into Play Store with the same Google account as I was using on the radio.

Search for "Home Switcher"

Hit "Install"

It then gave me a list of devices using that google account,

I choose "No carrier Rockchip Rk3188" and got the message it will be installed to your device shortly.

I went to the radio and waited for the app to be installed, I was then given the option to "Open"

When I open Home Switcher, no default set, I choose "Launcher" and set as default.

Uninstalled "Car Launcher"

All back to normal.
[MTCB Android Head Units Q&A] gmcmen:
Yes that sounds like an easier way, I am glad now it is working again.:o
[MTCB Android Head Units Q&A] robimo:
Hi, also I'm intested on buy the radio.

The only difference I've seen are the depth, 14 cm RK-A701 and 12,5 cm RK-A702 and the front buttons, home and return, are slightly different.

About the processor, quad or dual processor, BOH! :confused:
[MTCB Android Head Units Q&A] azebest:
hi i have done exactly what you have described above, but the cmd says : failed on bootanimation.zip - Read only file system !!!

Do you know why ?

I have done developer options USB debugging

I have Android version 5.1 on RK-A701.

I don't know how to remove the permission on the file bootanimation.zip

Please advise thanks in advance
[MTCB Android Head Units Q&A] gmcmen:
I have done it with my radio also on android 5.1.

What line did you type in cmd before you got the message about read only?
[MTCB Android Head Units Q&A] dtrain123:
Did you do this step:

adb shell

mount -o rw,remount /system

This changes the /system partition from read only to read/write. It sounds like yours is still read only.
[MTCB Android Head Units Q&A] caralvie:
azebest, some days ago I did it following steps described on page 24 by dtrain123 and all perfect !!!

---------- Post added at 12:59 PM ---------- Previous post was at 12:55 PM ----------

Probably everybody has maps for IGO (default navigator installed), but I left you link of IGO with EU maps. I don't know how older this maps are, but files date are 09/04/2016

dropbox ...file/d/0BxWq9izGpiPARGZGWk9xaHMwWlE/view
[MTCB Android Head Units Q&A] azebest:
OK now it almost works ! I have access to write I assume it was a typo error....

but when uploading file bootanimation.zip to my radio it starts transfer 1%, 2%.... up to 20% then error communication something like that... i suppose it is wifi bad communication, i have to do my test again closer than before....

i will let you know but I'm confident,

many thanks for your reply guys !
[MTCB Android Head Units Q&A] azebest:
it works fine now !

my radio was too far from the internet box wifi ! now everything is ok

I have Nissan logo, I would prefer 350Z logo or Z logo instead of Nissan, do you know where I can find it ?

Or do you know how it works to change the bmp file at the beginning by own file ?

---------- Post added at 07:26 AM ---------- Previous post was at 07:14 AM ----------

I have an error logo import fail, logo file must be 24 bit bmp

but i have saved the file in bmp 24bits ????

do yo know why ?
[MTCB Android Head Units Q&A] caralvie:
Logo animation you want import must be a specific file name. I don't remember... but I think is wrote some pages before
[MTCB Android Head Units Q&A] Vallaton:
I have use this unit 1 week and today volume knob stop working, pushing it work but cant adjust volume, any idea what might be solution?
[MTCB Android Head Units Q&A] gmcmen:
I don't know how to fix the button.

Move your finger left - right or right - left across the screen will adjust the volume.
[MTCB Android Head Units Q&A] azebest:
go to "Setting"

"system settings"

"function settings"

"steering wheel keys"

then you can change panel keys as you want...

you have to assign a button to each function...

---------- Post added at 05:53 AM ---------- Previous post was at 05:42 AM ----------

yes the name of the logo file is : ly_poweron_logo.bmp

I save it in USB memory stick and when plug into radio the importatin starts automatically !

but even if I save it in bmp 24bits, it doesn't work !

Anybody found how to do ? thanks
[MTCB Android Head Units Q&A] xm32:
On 4pda in the table of contents

Tune type

choose

Default и Half or Full wave
[MTCB Android Head Units Q&A] caralvie:
Start device ... wait, and some seconds after was loaded, insert pendrive and device automatically recognizes file and imports it. After this, you must go where change logo, and you will see your new logo
[MTCB Android Head Units Q&A] azebest:
yes it starts automatically but still a message "Logo import fail, logo file must be 24 bit bmp.

It is a 24 bit bmp file !!!! I don't know why it doesn't work ! i tried different bmp file still the same....
[MTCB Android Head Units Q&A] caralvie:
Only shows " "Logo import fail, logo file must be 24 bit bmp." or all message with filename...?

Is image 1024x600?

Remember, android is based on linux, filename and extension must exactly, be carefull with caps.
[MTCB Android Head Units Q&A] azebest:
only shows "Logo import fail, logo file must be 24 bit bmp."

I have to check if it is exactly 1024x600...

What is caps ?
[MTCB Android Head Units Q&A] caralvie:
Caps= capital letters. In linux operating systems you can have 3 files named logo.jpg, Logo.jpg, LOGO.jpg... In windows are the "same word, but not in linux.
[MTCB Android Head Units Q&A] azebest:
caps is good because if I make a mistake on the file name : ly_poweron_logo.bmp then it will not recognize it !

so file name + caps + extension seems to be good...

i have to check 1024x600

thanks for your support guys !
[MTCB Android Head Units Q&A] azebest:
yessss it works so resolution MUST BE 1024x600

bmp file

name : ly_poweron_logo.bmp

24 bits

i have done a drawing 1024x600 pixels on paint software and saved in bmp 24bits

Thanks guys !
[MTCB Android Head Units Q&A] PrinceOD:
I just received one of these running Android 5.1, really thankful for all of the information in this thread, hopefully I can contribute once I've had some time to play with it.

My main complaint at this point is that I find the contrast on the screen is pretty poor, is this something that can be adjusted somewhat via software controls? I am working on adjusting the angle in my mounting bracket (2002 Silverado) so my view angle is less oblique, but was hoping I could bump it up farther.
[MTCB Android Head Units Q&A] Totigyerek:
WC+ and WC2+ RK-A701

Hi, I have the same unit (RK-A701 ) ordered from Ebay and I questioned the seller about this WC+ and WC2+ wires, but his answer was not explicit. Then I ordered from Ebay a steering wheel control unit ("Car Steering Wheel Control Key Button For Car") and it works fine, after I attached it to the WC+ and WC2+ wires. Only problem is, this unit works only with preinstalled music player, but thru these WC+ and WC2+ wires you can control many things for example phone calls, screen brightness, volume, etc..
[MTCB Android Head Units Q&A] azebest:
did you try to assign new button with the procedure below :

go to "Setting"

"system settings"

"function settings"

"steering wheel keys"

then you can change panel keys as you want...

you have to assign a button to each function...
[MTCB Android Head Units Q&A] caralvie:
Confirmed... back USB have power when device is OFF, so leave connected OBD2 by USB sin't a good idea
[MTCB Android Head Units Q&A] chanchanman:
What is the '4pda table of contents'?
[MTCB Android Head Units Q&A] xm32:
4pda this is a Russian-language forum. There is a topic on the RK-A701 there yesterday posted a fresh firmware.
[MTCB Android Head Units Q&A] chanchanman:
Just to confirm, this worked for me!! What a silly configuration, i must have reverted mine to 'default' at some point when playing around with the configurations but setting it to 'Half wave' appears to have brought the volume knob back to life! THANK YOU VERY MUCH xm32!! :)
[MTCB Android Head Units Q&A] azebest:
did you try to connect via the bluetooth of the RK-A701 with others electronics devices other than smartphone ?

because mine works with my Galaxy S5 but it doesn't work with my ODBII ELM327 Bluetooth !!!!

Actually, the Torque apps says "enabling bluetooth..." but bluetooth is never activated !

In the Bluetooth menu we don't have options to see others devices in BT around the car radio ????

any idea ?
[MTCB Android Head Units Q&A] caralvie:
Not, sorry. I think only can connect for music, calls... other users try to connect different BT dongles but not works. Options I see is connect OBD2 by USB cable (torque Pro supports it) or use BT devices connected to phone with mirror link and use it touching radio
[MTCB Android Head Units Q&A] LVSAM:
OBD2 Adapter

Use OBD2 WiFi Adapter instead. Bluetooth only works for calls and contact retrieval on the stereo deck. I used OBD2 WiFi Adapter by Foseal from amazon and it works.
[MTCB Android Head Units Q&A] caralvie:
Has anyone installed "ionroad" or other augmented driving app?
[MTCB Android Head Units Q&A] azebest:
ok thanks for your reply !
[MTCB Android Head Units Q&A] garfield-cat:
Don't watch video while driving

I can see a couple posts in this thread about being able to disable that annoying message, but I can't find where someone posted how to get rid of it. Any help is greatly appreciated.

Thanks
[MTCB Android Head Units Q&A] gmcmen:
Read post #238
[MTCB Android Head Units Q&A] garfield-cat:
OK .. so changing the animated zip file overwrites the messages then I guess? I didn't make that connection from reading everything.

Thanks
[MTCB Android Head Units Q&A] gubacsi_alfred:
Hi guys!

I have just received a RK-A701 unit (Android 5.1). I tried to test it before install, but after the android icon leaves the following text appears on the screen: "No vehicle signal" That's all. The unit seems hanged.

Wiring: I connected the two front speakers, B+, ACC, to +12V battery, GND,GND and BREAK to -12V battery. Other pins are left open.

What can be the problem?
[MTCB Android Head Units Q&A] MoshPuiu:
remove gnd and break (bolded on quote)
[MTCB Android Head Units Q&A] gubacsi_alfred:
Thank you, but first BREAK was open as well. The unit did the same with opened "BREAK"
[MTCB Android Head Units Q&A] azebest:
it seems the RK swith direct to video in and see no signal because no camera !

---------- Post added at 08:37 AM ---------- Previous post was at 08:36 AM ----------

the "brake detect" wire (brown color) MUST BE connected to ground.

---------- Post added at 08:39 AM ---------- Previous post was at 08:37 AM ----------
[MTCB Android Head Units Q&A] gubacsi_alfred:
Thank you. The only difference is that I don't connect these pins: Rear camera, amplifier control, illuminate backlight. I think these can not cause this problem. I am not sure about can bus pins. Perhaps the unit is waiting for signals on can bus? Is it possible?
[MTCB Android Head Units Q&A] MoshPuiu:
You should connect only B+(pin 10 yellow), ACC(pin11 red) to +12V and GND (pin12 black) to -12V. Be sure there are no other wires accidentally connected somewhere.

The unit should start normally. If the unit doesn't start normally then it is defective.
[MTCB Android Head Units Q&A] gubacsi_alfred:
Thanks, I will try it. But I'm afraid I bought a brick.
[MTCB Android Head Units Q&A] dtrain123:
How exactly are you testing it? Are you using a 12V DC power converter or a car battery?

There was an earlier post where someone was using a 1.5 Amp 12V power converter and it wasn't enough to run the radio. Using a 12V car battery was still fine though.
[MTCB Android Head Units Q&A] gubacsi_alfred:
Thanks, but but tested it with a 12V battery.
[MTCB Android Head Units Q&A] batjump:
Please help

hello people,

i need a clear photo of this area in the circle

to replace the ic because is burned and i cannot read the code on it.

imgur.com/a/dXdfx

there are 2 photos in the link
[MTCB Android Head Units Q&A] azebest:
yes it is true battery is better or try with power supply minimum 2.5A
[MTCB Android Head Units Q&A] caralvie:
I saw the photo you upload in 4PDA forum. It's 4608 x 3456 (only registered users can download).

What do you do to burn it? :(
[MTCB Android Head Units Q&A] xm32:
http://s018.radikal.ru/i510/1704/08/999ddbbe7513.jpg
[MTCB Android Head Units Q&A] AIVID:
RK-A701 failing to BOOT cleanly

Battery Power is critical but the fact that the screen displays the little Andriod and then a second image sounds more likely to be a software problem similar to that in DOS where the "Config" is incomplete...or damaged!

My RK-A701 displays the little Andriod, then the "WARNING..Don't watch video when driving" image and then hangs for about 30 seconds until it automatically reboots.

Has anyone succeeded in creating a Bootable SD card or even a USB stick that bypasses the internal start up sequence?

regards

AIVID
[MTCB Android Head Units Q&A] caralvie:
Hi,

Did you connect CAN TXD and RXD working? My car named wires with CAN-H and CAN-L but I don't know wich is TXD and wich RXD.

Thanks.
[MTCB Android Head Units Q&A] xm32:
CAN TXD CAN RXD and CAN-H CAN-L it's different. Need can adapter
[MTCB Android Head Units Q&A] azebest:
and what kind of parameters the RK A701 can give us on the screen ?

is there any apps included in the RK A701 or we have to download ?

I have Torque apps do you think we can adapt it with direct CAN wires ?
[MTCB Android Head Units Q&A] xm32:
Torque usb and wifi working

Torque Bluetooth does not work
[MTCB Android Head Units Q&A] caralvie:
Remember use "switches" to desconnect devices. USB keep power suplied with radio (even with radio off), and wifi device is power supplied from OBD2 connector. Both can drain your car battery
[MTCB Android Head Units Q&A] dtrain123:
On the russian 4pda thread

They have a copy of the firmware update files: https://yadi.sk/d/SU0N6FrD3HHoie

They say to get a 1GB or 2GB thumb drive (larger ones don't work) and format as FAT32.

Then unzip all the files onto the root directory of the thumb drive.

You can then insert the thumb drive and try to update the radio.

I haven't tried the procedure myself so I'm not sure how it works. I don't know if it will be able to recover a bricked radio, but it's probably worth a try.
[MTCB Android Head Units Q&A] ku4e:
how to remove white circle on screen.
[MTCB Android Head Units Q&A] xm32:
Updated several times

https://www.youtube.com/watch?v=Ipppg3OSmjw&index=1&list=PL6iPOZn0Cv8ZKbcw_1VMWgd7MOl31r4ME&t=72s

https://www.youtube.com/watch?v=kzvHcbvez2A&index=8&list=PL6iPOZn0Cv8ZKbcw_1VMWgd7MOl31r4ME

Flash drive needed fat or fat32.

All other drives need to be removed.

First the tape recorder copies the files.

After copying, turn off the power and apply again. The flash drive can not be removed until the end of the firmware.

How to raise a brick I do not know

Some can not boot after replacing bootanimation with this method https://www.youtube.com/watch?v=rAGx2SdXyfo&index=7&list=PL6iPOZn0Cv8ZKbcw_1VMWgd7MOl31r4ME (I do not recommend trying)

---------- Post added at 09:34 AM ---------- Previous post was at 09:26 AM ----------

In the settings, the keyword floating
[MTCB Android Head Units Q&A] batjump:
ty very much my friend xm32 for your time and for the photo.

i need the other ic

please check the above photo

imgur.com/a/7FnNZ

i need a clear photo of this ic in the circle

ty again for your time
[MTCB Android Head Units Q&A] xm32:
http://s013.radikal.ru/i325/1705/95/ccc3b770dce2.jpg

Better photo at the moment no

When I install the fan I will take a picture
[MTCB Android Head Units Q&A] garfield-cat:
http://ibb.co/bWX66Q

I just happened to have mine out of my vehicle. I hope this is what you were looking for.

MP2482DN

datasheet: http://www.alldatasheet.com/datasheet-pdf/pdf/552122/MPS/MP2482DN.html
[MTCB Android Head Units Q&A] caralvie:
I don't know what 4pda user wrote about noise of fan. Did nobody thought add disipators?
[MTCB Android Head Units Q&A] batjump:
Ty xm32 ty garfield-cat.

Ty both of you.

I will replace it and i will let you know if i finally brink it back to life
[MTCB Android Head Units Q&A] caralvie:
Did anybody test a DVB-T app? I have an old USB DVB-T for windows and I want try...
[MTCB Android Head Units Q&A] gmcmen:
DVB-T Tuner working

I have a DVB-T tuner working with an app called PadTv.

This is the tuner Mini Micro USB DVB-T Android TV Tuner Stick, eBay item number: 322023688415

I put it on to a USB extension cable, but I needed a USB 2.0 A Male to Micro USB B Female adapter eBay item number: 142190454733
[MTCB Android Head Units Q&A] caralvie:
Thanks for answer.

I will test it with my item.
[MTCB Android Head Units Q&A] RustChl:
Hey guys,

I bought it and it worked fine... For 2 days. After, I started the engine, the unit booted, and then the screen display fade out into a foggy grey color a few seconds after. Since then, the unit always boots with that grey screen.

For the first few days, the music was still played from the unit each time I start the engine over. I was even able to skip a song by touching the screen where I remembered what was the "Next" button position, even if the screen didn't displayed anything...

Curently, still a grey backlighted display, but no sound anymore nor capacitive screen features.

Any idea about the problem and how to fix it ?

Thanks a lot !
[MTCB Android Head Units Q&A] gmcmen:
Have you tried the reset button?
[MTCB Android Head Units Q&A] RustChl:
Thanks for your reply.

I wasn't aware about a reset bouton. I'll search on this thread where to find it, and I'll try tomorrow.

But sincerely, to me it looks like an hardware issue more than a software one :(
[MTCB Android Head Units Q&A] MoshPuiu:
The unit is defective. The only thing you can do is to dismantle it and to check its internal cables and connections. You should pray to find only some bad connections...
[MTCB Android Head Units Q&A] RustChl:
Tried the reset button this morning, unit reboots to foggy grey screen :eek:

Thanks for your advice.

Already checked that. Unfortunately, no obviously exploded condensator nor disconnected wire. Everything seems soldered properly together.

The only exception I found is on the big protected circuit right in the center which is soldered with multiples tiny "lines ?" to the main board (sorry for that bad english). At one point only, three of these lines are soldered together.

I don't know if this is normal or if an overheat could have solder them together causing the device doesn't work anymore.
[MTCB Android Head Units Q&A] tspoon765:
This may the same problem I experienced, and sounds like it may be quite common. The solution is to unplug the ribbon cable and reseat it, as it may have a bad connection. This fixed the problem for me, although it re-occured several times. On the last occasion I neglected to remove the power plug, and while I was performing the operation the connections must have crossed or something, because a part on the main circuit board got red hot and failed catastrophically. So remember to remove the power first.
[MTCB Android Head Units Q&A] RustChl:
Hey ! Thank you very much for sharing your experience with me, I'll try this this evening after work.

How did you deal with that yellow glue which joins the ribon cable to the connector ?
[MTCB Android Head Units Q&A] RustChl:
This has not solved my problem, but however seems to have an effect.

I unplugged and replugged every ribbon cable I found.

When I connected it again to my car installation and turned the engine on, the unit booted to whiter screen with a freezed music app background immediately.

When I touched where the button were supposed to be, the screen reacted in some way. Few exemples :

• Dragging down the status bar happened in a brighter screen were the status zone was supposed to be, even following my finger.

• Clicking on the home screen menu button (or more precisely where it was supposed to be), produced wide horizontal white lines crossing wide vertical wide lines. App icons could have been where the lines are crossing each other.

These reactions appeared above the faded white frozen music app. Clicking the faded "Pause button" didn't update his status to a "Play button".

Pushing the home button resulted in a transition to the same faded white frozen music app.

I don't know if me manipulating ribbon cables helped or if this just the effect of rest time.

I don't know what I could do more nor on which ribbon should I focus on, since I don't know what are their respective purposes.

I'm open to any help or desperate idea.

PS : Ebay seller doesn't reply after a first answer asking me for transaction ID.
[MTCB Android Head Units Q&A] tspoon765:
Hmm, perhaps my advice just made it worse. Quite likely the ribbon cable idea has left the connections in a worse state. You could try re-seating them more, but it's possible that may only take you from white screen back to grey screen. Perhaps the grey screen was a different failure type. At this point, apart the re-seating, perhaps your best bet is to open a dispute with the vendor if possible.