meson-gxl-s905x-p212.dtb
copy u-boot-s905x-s912 to u-boot.ext

Thanks a lot, it worked with install option 106.

I tried a second TV box of this type, but the box does not boot.
I removed the shielding with a heat gun, maybe I damaged something?
I don't know exactly how to proceed further to find the issue.
Do you have any ideas?

log.txt

Do you have any ideas?

I also have a Q96 Mini TV box with slightly different configs, but I was able to get past @CarlKuhligk's issue.
You need to mount the boot partition and rename the file extlinux/extlinux.conf.bak to extlinux/extlinux.conf.

After that I was able to boot into an operational armbian system using a USB stick, and run the script armbian_install. That's when things went bad, and I might have bricked the device. It's currently on a bootloop with the following logs I pulled from the serial console of the board:

GXL:BL1:9ac50e:bb16dc;FEAT:ADFC318C:0;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0;
TE: 94130

BL2 Built : 11:58:42, May 27 2017.
gxl gc3c9a84 - xiaobo.gu@droid05

set vcck to 1120 mv
set vddee to 1000 mv
Board ID = 2
CPU clk: 1200MHz
DQS-corr enabled
DDR scramble enabled
DDR3 chl: Rank0+1 @ 912MHz - FAIL
DDR3 chl: Rank0 @ 912MHz - FAIL
DDR3 chl: Rank0 16bit @ 912MHz - FAIL
DDR4 chl: Rank0+1 @ 1008MHz - FAIL
DDR4 chl: Rank0 @ 1008MHz - FAIL
DDR4 chl: Rank0 16bit @ 1008MHz - FAIL
DDR init failed...
Reset...

The bootloop doesn't allow me to put the TV Box in any other state, that means no console prompt.

From what I was able to search for this error, I'm guessing the DDR memory configs are not right, perhaps it's the u-boot file or the dtb file I'm using. I'm using u-boot-s905x-s912.bin and meson-gxl-s905l2-x7-5g.dtb.

I have some pictures of my board:

I'm trying to get it recognized by the computer by connecting to one of the boards' usb ports and my macbook's usb-c port so I can try using the Amlogic USB Burning Tool or Amlogic Flash Tool to try to revive it. I've tried holding the reset button and connecting the usb cable to the computer at the same time (as described here) but no signs of a new usb device.

Any thoughts on getting this device on the "USB Burning" state? Is that the same as reboot bootloader or reboot recovery from android? If so, those might be gone from the internal flash by the armbian-install attempt.
If I need to make a new issue, please let me know.

where is the reset button of that?

where is the reset button of that?

Behind the P2 connector for the av port, you need to stick a SIM card tool, toothpick, paperclip or the tool of your choice in there to press it.