I have 5 Wyze bulbs (original version) in my vacation house and 2 more at main home.
Every time I access either bulb group, I’m prompted to upgrade the firmware. See photo 1.
When I go to upgrade, either individually or as a bunch at once, it shows all firmware is up to date. See photo 2. Screen shot below is of three bulbs, but all show same information.
App: 2.28.2 (a24)
iPhone 12, iOS: 15.3.1