A: This typically means the bootloader is corrupted. You will need a JTAG programmer and a binary dump of the boot ROM. Contact a specialized CNC repair shop like CNC Repair Services Inc. or Industrial Control Repair.
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Cause: The software restore loaded default KKT parameters, but your machine has non-standard limit switches (e.g., a 4th axis).
Solution: Enter the Hidden Service Menu (usually DIAGNOSIS > PRESS 8888). Manually re-enter your original stroke limits from the machine’s build sheet. A: This typically means the bootloader is corrupted