My firmware says 4.10. I've rebooted my phone, my watch, multiple times. The first time I rebooted my watch, the time just seemed to "fade" away but the watch never said "power off" like it has in the past. I rested it in off for about 5 minutes then turned it back on. The second time I rebooted it, it did say "power off" and I clicked yes. So after 3 reboots (2 that said "power off") it still says MArch 16. I've synced with Garmin connect on my phone multiple times also.
Thank you,
Stephanie.