I wouldn’t normally write about this, but it’s likely to be of interest, so it’s worth noting that Garmin has pushed firmware 2.50 for the CIRQA Smart Band. The changelog is simply one line: “Includes improvements to OHR.”
That one line COULD cover two very different problems
- The first is accuracy during fast changes in effort. This site’s own testing found wrist-worn CIRQA underestimated heart rate at the start of most reps in a running interval session, by roughly 9 to 10bpm, the worst result of any device in that particular test. Moving the band to the biceps fixed it: three reference devices agreed within half a beat in a repeat test. That’s more likely a sensor-and-algorithm problem tied to a specific kind of movement, not a fault.
- The second is no heart rate data at all. Garmin Forums and Reddit have multiple independent reports of the optical sensor simply stopping after charging, with no warning shown even though the band reports as connected and synced. The only fix users have found is powering the band off in the Garmin Connect app and back on via the button. A related set of reports describes heart rate, Body Battery and Training Readiness all stopping mid-day, despite the band being correctly set as the primary wearable.
Which one does 2.50 fix?
My guess is the second, not the first, as a one-line changelog that says “improvements to OHR” reads like a stability patch than a recalibration of the sensing algorithm across the entire Elevate Gen 4 platform.
Garmin CIRQA Smart Band
Screenless health and fitness band (no subscription required)
+other retailersQuick answers
What does Garmin CIRQA firmware 2.50 fix?
Garmin’s changelog only says “improvements to OHR,” with no further detail. The most likely target is the optical sensor dropout bugs reported on Garmin Forums and Reddit, rather than the interval-response accuracy lag found in this site’s own testing.
Does firmware 2.50 fix CIRQA's heart rate lag during interval training?
Probably not. That’s a sensor-and-algorithm issue tied to fast changes in effort, found in a single testing session rather than widely reported by other users, which makes it a lower priority for a one-line stability patch.
Why does CIRQA's heart rate sensor stop working after charging?
This is an unresolved, widely reported bug. The optical sensor stops responding after charging and doesn’t resume until the band is powered off in the Garmin Connect app and back on via the button, even though it shows as connected and synced.
How do I check what firmware version my Garmin CIRQA is running?
Open the device settings for CIRQA in Garmin Connect and look for the software or firmware version listed there. Updates roll out gradually, so not every unit receives 2.50 at the same time.
Last Updated on 20 August 2026 by the5krunner
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
