The PS4 motherboard stores two firmware versions at any given time: the (current version) and the inactive slot (the version you had immediately before your last update).
Most users on 10.50 are currently in a "waiting game." While lower firmwares (like 5.05) have permanent hacks, and newer firmwares (like 9.00) have reliable entry points, firmware 10.50 currently has no public exploit for running homebrew or backing up games. ps4 downgrade 10.50 to 9.00
Keep in mind that these resources might not directly provide a downgrade path from 10.50 to 9.00, but they can offer valuable insights into the exploitation process. The PS4 motherboard stores two firmware versions at