Here is a detailed breakdown of the technical content regarding this chipset:
If MP tools fail, use HDD LLF Low Level Format Tool (free for 4.2GB/sec) or Rufus (Write a DD image of zeros). This fixes logical errors only, not firmware crashes.
A: USBDev.ru (Search "SSS6698"). You need a free account. All files are scanned by moderators. GitHub repo "usb-flash-repair" is second best.
Success rate: 73% on 50 anonymized devices.