Before reflashing, always back up the existing firmware (even if corrupted, the bootloader may still be readable).
Using stm32flash:
stm32flash -r backup_nm368818.bin -v /dev/ttyUSB0
Store this file safely. It can be your best recovery solution. nm368818 firmware link
Many open-source CNC projects (GRBL, Marlin, Smoothieware) have community-maintained firmware dumps. Search: Before reflashing, always back up the existing firmware
site:github.com nm368818 firmware.bin
Look for repositories named cnc-firmware-backup or motion-controller-roms. Always scan the .bin file with VirusTotal before flashing. Store this file safely
Since a single "copy-paste" link is dangerous, here are the verified pathways to acquire the correct firmware.
As of 2025, the original manufacturer (often listed as “Ningbo Motion Control” or “Longs Motor”) has moved or discontinued direct support. Below are the most reliable methods to get a genuine firmware link.