Not a bug but a probolem that can happen and I write here the solution that worked for me to recover my system without new sd burning.
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Problema: ajustando el filtro CRT la pantalla se quedó en negro y no pude recuperar la visibilidad, tras reinicios o cambio de salida digital/analógico por comando en vrdos ( tecleando a ciegas).
Problem: adjusting the CRT effect the screen gone black and couldn't recover a viewable state, even after reboot or the digital -> analog -> digital mode switch with vrdos config command (blind typing).
Solución:
encender la máquina y esperar a que esté lista:
ctrl+d para ir a dos
escribir a ciegas : config /video FX
[tecla intro]
[tecla r]
y se desactivará el filtro CRT
Solution:
turn on the machine and wait until it's ready:
ctrl+d to open dos
blind typing : config /video FX
[enter key]
[r key]
and the CRT filter will disable
