DUDU7 8x128 does not boot anymore.

Golf7

II have a new DUDU7, 8 x 128. I powerup the HU on my desk with an external powersupply.
Via OTA I managed to install 3.6E and the Bluetooth update. So far so good.
But then I believe the power supply hampered. It could be that several boot attempts did not complete. Anyhow the HU does not complete the boot process anymore. Initially it ended up with text on the screen: “recovery_before” “Mult time no booted check1”.
Subsequently I prepared a USB stick with the installation files of 3.6E. However installing was not successful. The installation process starts, but always after 100 seconds, the progress bar is the about 25%, the HU boots, and starts installing from the beginning again. After four attempts the HU stops.
During these boots a message is very shortly displayed:
“recovery_before” ”start UpdateConfig 0 0!”
I tried 2 different USB sticks and installation with and without “Factory Reset” files. But with no success. So is there a solution?

Golf7

DUDU-Meng

Can you power on the device normally now?
If it won't power on, please try performing a forced factory reset. Place the update package on a USB drive, press the RST button four times—each time after the screen lights up and displays the error logo.
You may repeat this process several times.

Golf7

Hi, thanks for your reply!
Unfortunately I am still not able to boot/install the software.
After each installation attempt, from a USB stick, the screen is always black. So there no real error message on the screen.
I tried many times your factory reset suggestion at various moments in time. Anyhow there was never a message on the screen indicating a factory reset. Nor there was a difference in the behavior during the installation process as I described before.
I tried a faster and a slower USB stick. But always during reading the USB stick, the system restarts the installation process after 105 seconds. So it looks not to be dependent on the amount of data that is read in these 105 seconds. I also tried a more powerful powersupply but that did not make a difference.

DUDU-Meng

Golf7 Hello, based on your situation, it is highly likely that there is a hardware issue. Please contact our sales representative.