Before diving into the "how," you must understand the "why." The Unowhy Y13 is not a standard retail laptop. It is managed by software, typically Wicoms or Lanschool .
Quick checklist for a portable repair kit unowhy+y13+bios+password+portable
Flash a clean BIOS dump from a donor Y13 using a CH341A programmer (requires partial disassembly), but the portable USB method should do it. Before diving into the "how," you must understand the "why