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Android Car Head Unit 7.1.1 keeps restarting/rebooting

Hi, I bought long time ago for my Mercedes W203 an Android Head Unit from Aliexpress. Yesterday I was searching how to turn off its bluetooth so I went to Factory Settings; insert 126 as password; an change in the first page bluetooth from"md..." to "Parrot..."
After saving and exiting it asked for reboot.
Till now while I am driving the Head Unit keeps restarting/respring. I also tried to reset and remove the battery of my car without any luck.
Here are some specification of the Head Unit (I wrote them before having the problem):
Model: px3 (1024x600 W)
Android Version: 7.1.1
CPU: ARM Coretex-A9 @1.6GHz (x4)
Memory: 2048 MB
Kernel version: 3.0.101+ | [email protected] #476
Build number: px3-userdebug 7.1.1 NMF26X eng.hct.20170509.102343 test-keys
MCU version: MTCD_KD_V2.41_1
Please!!! Could anyone help me fix it?

Need root for Dicola CHS7047X Android 8.0 MTCE car head unit

Hopefully, I'm posting in the correct sub-forum.
This is the unit.
I believe these are the full specifications:
Rockchip PX5 (2017)
ARM Cortex-A53 Octa-core ≤ 1.5GHz (28nm)
PowerVR G6110 GPU (2014)
4 GB DDR3
AOSP Android 8.0
1024x600
STMicroelectronics TDA7388 audio power amplifier (2013)
STMicroelectronics TDA7786 AM/FM funer (2016)
In the software itself, it shows:
Manufacturer: rockchip
Model number: PX5
Android version: 8.0.0
Android security patch level: October 5, 2017
Kernel version: 4.4.93+; [email protected] #121; Fri Jan 26 10:41:07 CST 2018
Build number: px5-userdebug 8.0.0 OPG5.170623.007 eng.hct.20180126.113204 test-keys
MCU version: MTCE_CHS_V2.76_1; Dec 20 2017 15:49:46
CPU: 8 core 64-bit CPU Coretex-A53 @ 1.5G
Does anyone know if the unit can be rooted?

https://forum.xda-developers.com/showpost.php?p=76725981&postcount=740

Android 8.0 unit won't connect via. USB mobile broadband dongle

When I plug in my Huawei E3372h-153 (with compatible Three SIM card), the unit shows 'No service' and an empty signal meter in the status bar.
When I plug it into my tablet, it works instantly.
The USB dongle is out in the open and in a signal-covered area so this is definitely an issue with the unit somewhere.
This is the unit (Dicola CHS7047X):
Rockchip PX5 SoC (2017)
ARM Cortex-A53 Octa-core ≤ 1.5GHz (28nm)
PowerVR G6110 GPU (2014)
4 GB DDR3
AOSP Android 8.0
1024x600
STMicroelectronics TDA7388 audio power amplifier (2013)
STMicroelectronics TDA7786 AM/FM funer (2016)
In the software itself, it shows:
Manufacturer: rockchip
Model number: PX5
Android version: 8.0.0
Android security patch level: October 5, 2017
Kernel version: 4.4.93+; [email protected] #121; Fri Jan 26 10:41:07 CST 2018
Build number: px5-userdebug 8.0.0 OPG5.170623.007 eng.hct.20180126.113204 test-keys
MCU version: MTCE_CHS_V2.76_1; Dec 20 2017 15:49:46
CPU: 8 core 64-bit CPU Coretex-A53 @ 1.5G
Any ideas?
It's rooted, if that helps.

King Mustard said:
<post snipped>
Click to expand...
Click to collapse
Anyone have any ideas?

HCT PX REV4.0 - Black screen after update

Hey,
I managed to mess up my perfectly working radio trying to update to Android 9.
The recovery was updated to android 9 followed with the mcu update after which it got the black screen.
I presume this happened due to my reading dissability as I first flashed the mcu with MTCE_LM instead of MTCD_LM.
Is there anyone willing to look at the board and try fixing it for me before my wife murders me? Thanks in advance!
Best,
Peter
P.S.
Model Number: A-Media Auto (1024x600 W)
Android version: 6.0.1
CPU: 8 core 64-bit CPU Coretex-A53 @ 1.5G
Memory: 2G
Mcu Version: MTCD_LM_V2.44_1
Board: HCT--PX5-REV4.0

Producer url with orginal firmware to PX5

Hello.
First, Sorry to my english.
And I need update my andoid auto PX5
PX5(1024x600)
android 9
rk3368-userdebug 9 PI 20200520.190100 test-keys
4.4.167
MTCE_MX_V3.53_1
May 25 2020
CPU Octa-core Cortex-a53 @ 1.5G
What I find producer www with orginal firmware to PX5 to update?
Best Regards
Christoph