My Hp probook 450 G4 Wifi adapter is missing after a bios update 1.18 to 1.39. I tried several ways to fix this issue but nothing work for me. I don’t have any backup of my old bios. Once I downgrade it to 1.37, so Rollback is not possible. What to do now? I think if anybody give me a 1.18 link that would lead to desired satisfaction. Thanks in advance.