[MTCD Android Head Units General] Geniee33:
Here are my notes regarding the Eonon GA6164F and recovering from a black screen, cant boot, cant get into recovery.

Thanks to all the members and information on this site who i was able to piece together to come up with this solution.

I still dont know if my assumptions are totally correct, (please comment if i need to learn more) .

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Back Story : My device was shipped with a Dec 2016 Android 5.1.1 build, and my steering wheel keys on my Camry were not all working.

Skip track and Back track were doing the same action, I tried re-learning/mapping in "WheelKeys Study" but nothing fixed it.

I resorted to using Vol - + for volume, Skip forward = skip track, MODE button (underneth) as = skip back.

I contacted Eonon about this, and they gave me a new Android build to try, update.img.

I wasnt able to update using the Settings - About - Software Update. (Error finding file).

I wasnt able to update using the standard recovery options (RES button, power etc.)

I did notice it was looking for dupdate.img.

I renamed my update.img file to dupdate.img and it was able to install via the Settings - About - Software Update.

The device rebooted , installed, then nothing... just a black screen.

I couldnt get any display up no matter what i tried.

After 24 hours or so of testing/trailing etc. I did manage to get it back working.

Im certain it was a bad update file because once i had it working again, i re-applied the update file i was supplied and sure enough, it broke it again.

These are my notes on how i recovered it.

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Reboot into recovery on a healthy device

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Hold RES

Press Power

Release RES (while still holding power)

Let go of power 1-2 secs after

Should reboot into recovery

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Boot into recovery and restoring on a un-healthy device

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If cant boot into recovery

Download a Malaysk android build file (you may need to sign up to the hosting server site, and then add to downloads, then you can download to your computer from there)

Create bootable SD card using 'rockchip create upgrade disk tool v1.4'

(Run .exe as admin, dont check 'SD Boot', just leave 'Upgrade Firmware'

(If you cant see your USB drive, check that you have right clicked-Run as Admin in windows on the .exe)

Select Malaysk MTCD dupdate.img file

First post has download links

https://xdaforums.com/android-auto/mtcd-discussion-questions-development/rom-malaysk-roms-mtcd-device-t3385309

Fully power off device (unplug from the back/or remove neg battery from car).

Insert new-bootable SD card into GPS slot

Plug device back in (or reconnect neg. battery cable to car)

- Device will boot into recovery and complain about no update file (thats fine) the Bootable SD card is just to get you into recovery.

Once in recovery, remove the GPS slot SD card and plug in a USB stick with an update.img

(my machine was looking for dupdate.img so i had to rename it).

Press power button to skip down the settings

Hold power button to select an option

Select 'Update system/mcu image from usb and clear all'

<processing>

Device reboots

Toyota logo shows (never progresses)

Press RES

Device reboots

Toyota logo shows

Android is starting (optimizing app XX of XX)

Malaysk recomends once the build is installed, to reboot into recovery once again using the normal method of buttons (RES + Power etc.) and 'wipe all data/factory and cache reset'

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Now i am running a 10.8 build, because i was having trouble with the Google services on the latest, and i need to learn more about the 11.4 build and the MicroG stuff that replaces the Google services.

I am still suffering from the steering wheel controls issue, but at this point... i dont care...

I found i am getting a lot of "unable to read file" from the m4a files i have on my SD or USB card/stick and i need to learn more about how to get the steering wheel controls to action "other" music apps, i believe this is to do with the MTCD-Keys stuff, but going from what seemed like a dead device to this point, i want to wait a while before i start playing with it again.

I have added pictures in the thread, but they are linked to a photobucket, so i have also added them as attachments in case that photobucket account ever goes down.