Can someone help me understand UART output from Beelink GT1 Ultimate tv box (no HDMI signal, endless UART loop)?:

    I have Beelink GT1 Ultimate tv box. One day some app froze and I turned power off and on. After turning power on, I had no signal on TV and it’s been like that ever since. I contacted Beelink and they gave different 2 images (GT1_709D0.img and GT1_708D0) to try flashing with USB Burning Tool. However, USB Burning Tool always gets stuck at 7% formatting with the following error:

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    error: [0x32030201]Uboot/Get result/DiskInitial error.

    I tried every possible combination (different ports, power on/no power after reset, force erase, etc). The only positive is that the box is detected by USB Burning Tool.

    I also tried making bootable sd card with Burn card maker using those images but it didn’t help either – UART output provided.

    Can someone tell me based on the UART logs below what is going on and suggest steps to debug/resolve it?

    The interesting part is that every time UART output stops at these two lines and when I googled those lines, it seems other people tv boxes logs, where I found these lines, there is more output following them but in my case it always stops at those lines:

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    emmc/sd response timeout, cmd8, status=0x1ff2800
emmc/sd response timeout, cmd55, status=0x1ff2800

    Here is the UART output with normal operation – endless loop:

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    GXM:BL1:dc8b51:76f1a5;FEAT:ADFC318C:80;POC:3;RCY:0;EMMC:0;READ:800;SD:800;USB:8;LOOP:1;EMMC:0;READ:800;SD:800;USB:8;

    ...

    Here is the UART output when trying to flash with USB Burning Tool:

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    Here is the UART output when trying to use bootable SD card:

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    Thanks in advance for your help