You may have an adapter to make an UART log of u-boot? The error you describe sounds like a issue I know of “not tested” u-boot firmware and it could be fixed easily.
Take a look to Google to find some help on the PCB & UART. If you got a u-boot UART log the half way to fix the problem is already done.
Open your box. Find a 4 pad connector (usually the connector is not soldered but you can find the place where should be). Usually the pads are marked as GND, TX, RX, 3V3. If not then one pad has different shape that is the GND.
Buy a cheap USB-serial adapter like this:
Connect the GND and TX pin of your box to the GND and RX of the adapter. Start a terminal program and watch the messages from your box.
Before upgrade your u-boot read the Wiki carefully!!
The new binary at the realease page is running with 792MHz - a little bit faster than the original.
If you get crashes (sometimes) after the upgrade it is maybe necessary to decrease the speed!
The DTB should be gxm_q201_3g_1gbit.dtb or gxm_q201_3g.dtb. I don’t know if you have gigabit or not.
First I want to thank you all for support.
Just a couple of questions more.
I read the wiki but I dont understand exactly what to do. Where can I find e tutorial for rookie? I dont know what to do with u-boot_q201_v5_v6_blue_PCB.tar.gz file…
could it be necessary to reinstall Coreelec?
last question: I am configured to boot from sd and use internal memory for data (https://forum.libreelec.tv/thread/9425-howto-boot-from-sd-card-use-internal-memory-for-data/ ? postID = 57670 # post57670). Does the new Uboot have any effect on this configuration?
I use CoreELEC as a Samba server and TV server, for all the TVs and devices in my house and on the internet via VPN when I am away, therefore it is always on. I also do a daily automatic scheduled restart and this is where I have had problems because the reboot happens when the HDMI connected LG TV is turned off: low resolutions after the reboot and loss of control of the LG TV remote control CEC, I have solved this by canceling all the CEC controls in the Kodi settings Settings-> System-> Input-> Peripherals-> CEC_Adapter (keeping CEC enabled) and adjusting the admissible resolutions in the file /storage/.kodi/userdata/disp_cap