I refer to computer parts or devices like Routers or Motherboards where vendors release newer firmware over a period of time. However, for some upgrades vendors clearly mention that once you upgrade to this version, you will not be able to downgrade anymore.
e.g. TPLink Archer C6 Firmware Rev 1.3 or ASRock X470 Taichi Ultimate motherboard BIOS Rev 3.3
What is the technical justification for preventing users from downgrading to an earlier version of firmware once you upgrade to a specific version? Is there any specific technical concept that governs this behavior?