According to [this article][1] I should be able to switch to ARMv8 on my Raspberry Pi Model B, but I'm getting ["rainbow screen"][2] after adding to `config.txt` the line:

    arm_control=0x200

Why is it not working? Is it even worth switching from ARMv7 to ARMv8?

  [1]: https://elinux.org/RPi_config.txt#Enable_ARMv8_on_RPi3B
  [2]: https://elinux.org/R-Pi_Troubleshooting#Coloured_splash_screen