svdmk

Two same boards but different cpu. Rockchip labeled works fine with armbian, multitool and libreelec. The board with huawei labeled cpu has the previously described problem, multitool and armbian stop working after a minute. Method of switching bootloaders suggested by @jock works.

You are so right. What a surprise when I removed the heatsink! Probably that's why this board has trouble during booting process.

I see that OPTEE is still in developing. Is it possible to implement option to choose which bootloader to use during the compilation of the armbian image?

Everything is OK, strange but working solution. Now when the box does not turns off I was able to add overlays in armbianEnv.txt ( emmc-hs200 and ddr3-800) and armbian booted at first time. Now I have armbian on internal flash and can install octoprint server. Big thanks @jock

Nothing happens when I change direction and value. When I do software reboot the direction and value remain the same but if I do power reboot the direction and value return to their original state.The issue remains, system still switching off. But I noticed that deleting the flash partition, the system works normally. I used to think that the system was working because it founds a correct partition in the flash, but when mmcblk2p0 is no longer there, remains only that part of the armbian image before the root file system, which is before sector 8192. Blank emmc or flashed with newer armbian image cause problem but flashed with armbian 21.02.1 the OS works.

That's right. I use multitool only to erase internal flash and then use rkdeveloptool to flash loader and image as it is described in first page. The device boots from sdcard in both cases, blank or flashed emmc but if there is a proper partition on internal flash Armbian works right, otherwise turns off(I heve tried to erase emmc and create partition with fdisk tool in Armbian, and OS works properly ). Armbian boots from internal flash too. I think booting issue and turning off after minute are two different cases. Turning off probably is some kind of interaction between RAM and EMMC into EMCP chip itself(kingston 08emcp08-el3cv100). This is dumped android firmware: https://drive.google.com/file/d/1ZLl-KCvGS47SAO8tY1YDvCHDv6YWIWRP/view?usp=sharing

It is not power or thermal issue, if there is partition with filesystem on emmc, Multitool Armbian and Libreelec works from sd card flawlessly. I have resolved problem running Armbian on sd card, I still can't install Armbian on internal emmc. I tried different overlays: cpu-stability, emmc, emmc-hs200, ddr3 and other with no success. Probably that is wrong settings of emmc, I will check internal flash with mmc-utils.

Tv box mxq pro 4k 5g, pcb zq01-v1.3 rk3228a and kingston 08emcp08-el3cv100, wifi esp8265. Multitool boots properly but after a minute the box turns off(Libreelec has same behavior). This minute is enough to erase emms but not enough to flash img on board and bricks the device. Rkdeveloptool works great in maskrom mode and I managed to burn loader and image. I tried Armbian_21.02.1_Rk322x-box_buster_legacy_4.4.194.img , Armbian_23.08.0-trunk_Rk322x-box_buster_edge_6.5.5_minimal, Armbian_23.11.1_Rk322x-box_jammy_current_6.1.63_minimal and self compiled Armbian-unofficial_24.2.0-trunk_Rk322x-box_bookworm_edge_6.7.5_minimal on emmc and sd card with no success. Every time booting process stops and every time on different point despite of so many reboots, and after a minute the box turns off. I noticed with fresh written on emmc Armbian_21.02.1 , Multitool works properly (libreelec too). So I decided to try Armbian-unofficial_24.2.0-trunk on sd card and after more than 20 reboots I managed to set root password and Armbian works fine on sd card. Multutool , Armbian and Libreelec works from sd card on this strange decice only if there is partitision with filesystem on emms, othervice it turns off after a minute. I tried to install Armbian from sd card to emmc with armbian-config with no luck, box does not boot from emmc and from sd card again turns off after 1 minute. Any suggestions how to install Armbian on internal flash? Why Armbian needs so many reboots to reach finish point?