gonp Can you boot from SD card (so emmc is not in-use) and then (re)write this image to emmc:
https://chewitt.libreelec.tv/testing/LibreELEC-AMLGX.arm-11.0.1-wetek-hub.img.gz
I've modifed U-Boot with the content from this patch, but I'm nowhere near a Hub board to test it:
Bootloader-Builder/0003-Autoboot-keyboard-beaglebone-fixes.patch at fix/autoboot · BrianAdams/Bootloader-Builder
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The patch should cause u-boot to pause if input is detected on the <space> key, and then you have 15 seconds to type "stop" to enter the u-boot console else it resets and boots again. The possible flaw is that constant noise might result in persistent triggering of the pause and reset cycle, but the first step is to ensure the changes are present in the image linked above. If yes, then we can fine-tune the behaviour.