RK3188 KLD MTCB unit not powering up - MTCB Android Head Units Q&A

Hello everyone,
I have an 1-DIN RK3188 KLD MTCB unit. I was using a Malaysk firmware for some time now with no problems except some random reboots now and then. Yesterday, after changing a setting for reverse camera (mirror - off), the unit just died. It is not powering on unless I use reset + volume know combination. The screen does not come out, nothing. When short press the reset key, the buttons blink once. When using the reset + volume knob combination, the unit powers on to recovery and stays on no matter if acc on or off (before, when acc where off, the unit shuts down). Tried to reflash with original firmware with no success. Any ideea what could have happen and what can I do?
LE: I managed to make the screen come out (must press the open button right after power on). Tried installing factory firmware but when reaches reboot it is shutting down. Could it be the MCU?
Thank you!

UPDATE: After some tries to reinstall the firmware (both Malaysk ROM anf factory ROM), I also updated the MCU. Unfortunately, no change. Then, I started to look for the problem elsewhere. I discovered one faulty fuse, exactly the one responsible for ACC 12V at the unit. After I installed a new fuse, the unit successfully booted but now I can no more control the flip-up screen. I flashed the MTCB-KLD-V2.78 MCU. Is this MCU universal (both 1din and 2din) or do I need a specific one?

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Hi! Anybody knows how to enter recovery mode on this device? I looked trough the forum but holding a reset button till the other buttons lights are flashes, not work, also tried to hold it 25 sec and when it boots up press the reset button again doesn’t work. So any ideas welcome!
Thanks!
It is a PX5 unit Cortes a53 chip, and no buttons apart the reset button.
benicsalad said:
Hi! Anybody knows how to enter recovery mode on this device? I looked trough the forum but holding a reset button till the other buttons lights are flashes, not work, also tried to hold it 25 sec and when it boots up press the reset button again doesn’t work. So any ideas welcome!
Thanks!
It is a PX5 unit Cortes a53 chip, and no buttons apart the reset button.
Click to expand...
Click to collapse
After hold reset button for x seconds you have to release and press immediatly not to wait after reboot.
AlexRuhl said:
After hold reset button for x seconds you have to release and press immediatly not to wait after reboot.
Click to expand...
Click to collapse
I tried that one as well, but nothing, and still a question how long i need to hold the reset button?
benicsalad said:
I tried that one as well, but nothing, and still a question how long i need to hold the reset button?
Click to expand...
Click to collapse
Hold reset button until led keys are blinking. This method works for me( radio without phisical buttons like you)
AlexRuhl said:
Hold reset button until led keys are blinking. This method works for me( radio without phisical buttons like you)
Click to expand...
Click to collapse
I tried to hold the reset button for 30 sec but the led keys are not blinking, this is my issue, I looked trough the forum, YouTube but can find any solution.
I asked the seller but nothing back at the moment. Wanna go back to android 6 form android 8, and without recovery mode don’t know how
benicsalad said:
I tried to hold the reset button for 30 sec but the led keys are not blinking, this is my issue, I looked trough the forum, YouTube but can find any solution.
I asked the seller but nothing back at the moment. Wanna go back to android 6 form android 8, and without recovery mode don’t know how
Click to expand...
Click to collapse
Could you please post a screenshoot of information of radio?
AlexRuhl said:
Hold reset button until led keys are blinking. This method works for me( radio without phisical buttons like you)
Click to expand...
Click to collapse
AlexRuhl said:
Could you please post a screenshoot of information of radio?
Click to expand...
Click to collapse
Here it is, thank you for your help and time!
benicsalad said:
Here it is, thank you for your help and time!
Click to expand...
Click to collapse
I have an idea: put on sd an .img file corrupted and try to upgrade mcu..radio will go to recovery and stop here because the file is invalid..after you can put an sd card with what you need to downgrade
Can I just downgrade, because I think it is a different file system under android 8. I can download an app what put the radio into recovery mode, but i’m not sure downgrade is that easy,so I downloaded malaysk rom (android 6) already, do you think it will be strait forward?
Yes I downgraded with a stock rom with make a autostart sd(see the discussion like upgrade) only put sd and wait
AlexRuhl said:
Yes I downgraded with a stock rom with make a autostart sd(see the discussion like upgrade) only put sd and wait
Click to expand...
Click to collapse
It didn’t work out exactly how I planned, but I ended up in recovery mode somehow and eventually downgraded my unit, thank you for you time and effort
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benicsalad said:
It didn’t work out exactly how I planned, but I ended up in recovery mode somehow and eventually downgraded my unit, thank you for you time and effort
Click to expand...
Click to collapse
How did you manage to enter recovery?Fake .img or .zip on usb?
tokesszabi said:
How did you manage to enter recovery?Fake .img or .zip on usb?
Click to expand...
Click to collapse
Hi same question here...
Im not sure, I used one of the downloaded image and I ended up there, sorry guy, car sold with the unit.
My device is completely broken and the system does not boot. How to go to recovery mode? Even the buttons no longer work, only the boot image
HI, my Dasaita MAX10 is in boot loop animation. I want to go to recovery, i see flashing touchbutton pressing reset button at startup (ignition on) but then I can't see recovery even if I release and press the reset button. Does someone have the same issue ?
angelopellef said:
HI, my Dasaita MAX10 is in boot loop animation. I want to go to recovery, i see flashing touchbutton pressing reset button at startup (ignition on) but then I can't see recovery even if I release and press the reset button. Does someone have the same issue ?
Click to expand...
Click to collapse
I had the same issue.
Was able to boot recovery from SD-Card
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In this recovery I was able to flash a current Firmware and got it working again.

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I am sorry I posted this in the wrong place.

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