Same here, to me everything starts fine, both steamvr and driver4vr, but then they both immediately give the error Init_HmdNotFoundPresenceFailed. I googled and bit and found an old github (2017) thread where they said that a possible solution would be to set “hmd_presence” in the driver.vrdrivermanifest to “*” (instead of the value []), I tried that and now it gives the error Init_HmdNotFound followed by a steam vr fatal error