The hex data scrolled down the screen like green rain. The T580 was talking. Its MISO line was sending out the corrupted BIOS in a last gasp before oblivion.
Ensure wire length is under 5cm. Check for broken CMD/CLK lines. VCCQ issues: Verify 1.8V1.8 cap V with a multimeter on the wire, not just the box setting. t580 isp pinout
When using ISP on a T580, have the laptop battery or the AC adapter connected. The programmer provides the 3.3V (VCC) necessary to power the chip. If you provide external power while the programmer is attached, you risk frying the motherboard's EC (Embedded Controller) or the PCH. Tools Required for the Job The hex data scrolled down the screen like green rain