I updated to the latest iOS today and I heard there is a new version for Airpods also. So I paired them with the device then put them in their case.
What's interesting is that you can't check their firmware on the iPhone since they just disappear from the general->about
menu on the iPhone.
Actually they are no where on the phone, but you can still hear music and pair them.
Not only I don't know how to update them, I also can't check their version now.
Best Answer
Credit to 9to5Mac
To check & update the AirPod firmware, do the following:
Settings -> About
.AirPods
section in theAbout
menu.Firmware Version
is not 3.5.1 then you'll need to update them. Just keep them in their case, plug them in, and next to your iPhone. The update should happen automatically. It might take a few hours so it's best to leave them overnight so the update can take place.