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41e21b6494
Issued while the payload owned the LANCE: the reply arrived, control went to 0x3F200040, the screen went black -- and the OS was back 88 s later. Port 771 reopened on its own, the unit answered ping, and a VRAM screenshot shows the Terminal Manager with the right MAC/IP/LAT name and the clean-boot "Ethernet Port Error - 24" banner. A taken-over unit can therefore hand itself back without a power cycle. An earlier reading of the same run reported "black and hung, needs a power cycle". That was a single observation taken inside the ~90 s POST window. The black screen is the reset path reprogramming the board/video window (0xC00000B0, 0xC0000100) and not re-enabling the display until POST ends. vtcmd.py reboot now says how long it takes and warns not to power cycle during it, instead of refusing to run.