You got return (''code 2'') from exit from external ''NBP'' binary.

Example running ''memtest.0'' and pressing ''ESC'' to exit:
[[https://b800.org/3AXUm|{{https://b800.org/3AXUm.png}}]]

See common [[err:7f8d8101|Return code 1]] and [[err:7f8d8100|Return code 0]]