Did you apply the device update also?
I performed the Oculus update but didn't get round to using my HMD until the next day, and when I put my headset on, all I had awas a black screen and two amber LEDs.
I forgot I'd performed an update the previous day, so I launched the Oculus desktop software, and low and behold, I see a red banner at the top asking me to perform device updates.
Once I did that everything returned to normal functionality.
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