Stress

https://docs.armbian.com/User-Guide_Getting-Started/#how-to-login

In case your password change is not accepted, you have a problem with ready only / corrupted file system due to bad SD card or power supply. 

found a solution with the wifi issues:
i made /etc/network/interfaces like this:
user@amlogic:~$ cat /etc/network/interfaces
source /etc/network/interfaces.d/*
# Local loopback
auto lo
iface lo inet loopback
user@amlogic:~$ 
Now is connecting without problems...
In fact i'm writing this message straight from the box.
I'm in the 6th forced reboot by unplugging the power adapter.

This image was EXTREMELY unstable for my box.
 
I changed only 6 thigs so far:
1) Added the "wifi_dummy" in /etc/modules
2) Removed tsched=0 from /etc/pulse/default.pa
3) Stopped NetworkManager service ( sudo service NetworkManager stop)
4) Removed network-manager from startup to save me ~6 minutes delay ( update-rc.d network-manager remove )
5) Added my wifi details in /etc/network/interfaces:
source /etc/network/interfaces.d/* # Local loopback auto lo iface lo inet loopback auto wlan0 iface wlan0 inet dhcp wpa-ssid MyAccesPointName wpa-psk mycopmplexpassword 6) removed nodm and added lightdm
Right now the system seems stable and the one core was 100% is gone ( all cores are in sane percentages )
Now lets test some HD videos with kodi :-)

1. Button makes the built-in bootloader (u-boot) in the first place to look for on an external storage medium a file (aml_autoscript). If it is, go to it aml_autoscript. If there is no such file, the loader starts the built-in recovery mode. In theory, you could write your own version aml_autoscript that will load from external media new u-boot and will give him control. But it requires a good knowledge of the structure of u-boot (source code for your specific model) and the availability of special commands for the complete transfer of control the new u-boot on an external drive.
2. If you need to boot from external media (without making any changes multi-boot) you can rename the script s905_autoscript in aml_autoscript and pressing the button will immediately run the script to start the system from external media. In this embodiment, for system start up from external media will need to click when you enable this button.

Run terminal
 
sudo modprobe wifi_dummy
 
or
 
sudo modprobe dhd

To ALL
 
In the last images I removed from startup all the modules of Wi-Fi. They prevent launch on some models of TV boxes (which require other modules for WiFi). So you need to manually (via terminal) to verify which model is suitable for your TV model and enter it in the file /etc/modules (for later auto run at startup).