02-19-2022 20:38
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02-19-2022 20:38
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Is there a documentation history giving a table of the various OS releases and corresponding OS Simulator and watch firmware versions and release dates?
It would be helpful in trouble shooting and knowing which versions are compatible.
Author | ch, passion for improvement.
Answered! Go to the Best Answer.

Accepted Solutions
02-22-2022 04:00
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02-22-2022 04:00
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The developer blog has the SDK releases and details. Here's a list of firmware versions for each release:
SDK 1.0
-
Fitbit OS 1.2 - x.31.1.29
-
Fitbit OS 2.0 - x.32.4.19
-
Fitbit OS 2.1 - x.32.10.15
-
Fitbit OS 2.1.1 - x.32.10.20
SDK 2.0
-
Fitbit OS 2.2 - x.32.12.19
SDK 3.0
-
Fitbit OS 3.0 - x.33.1.30
SDK 4.0
-
Fitbit OS 4.0 - x.68.9.15
SDK 4.1
-
Fitbit OS 4.1 - x.70.7.14
SDK 4.2
-
Fitbit OS 4.2 - x.71.6.19
SDK 4.3
-
Fitbit OS 4.2.2 - x.72.1.15
SDK 5.0
-
Fitbit OS 5.0 - x.128.1.42
-
Fitbit OS 5.1 - x.128.4.15
-
Fitbit OS 5.1.1 - x.128.4.17
SDK 6.0
-
Fitbit OS 5.2 - x.128.5.38
02-19-2022 21:48
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02-19-2022 21:48
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I'm not aware of a good list.
If you hover a mouse over the 'supports' text in GAM, you'll get some clues.
You can also look in .\node_modules\@fitbit\sdk\lib\buildtargets.js for some other clues, but I'm not sure how to interpret them.
I know this wasn't a satisfying answer!
Gondwana Software
02-22-2022 04:00
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02-22-2022 04:00
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The developer blog has the SDK releases and details. Here's a list of firmware versions for each release:
SDK 1.0
-
Fitbit OS 1.2 - x.31.1.29
-
Fitbit OS 2.0 - x.32.4.19
-
Fitbit OS 2.1 - x.32.10.15
-
Fitbit OS 2.1.1 - x.32.10.20
SDK 2.0
-
Fitbit OS 2.2 - x.32.12.19
SDK 3.0
-
Fitbit OS 3.0 - x.33.1.30
SDK 4.0
-
Fitbit OS 4.0 - x.68.9.15
SDK 4.1
-
Fitbit OS 4.1 - x.70.7.14
SDK 4.2
-
Fitbit OS 4.2 - x.71.6.19
SDK 4.3
-
Fitbit OS 4.2.2 - x.72.1.15
SDK 5.0
-
Fitbit OS 5.0 - x.128.1.42
-
Fitbit OS 5.1 - x.128.4.15
-
Fitbit OS 5.1.1 - x.128.4.17
SDK 6.0
-
Fitbit OS 5.2 - x.128.5.38
02-22-2022 06:31
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02-22-2022 06:31
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@JonFitbit- Thanks so much - that's really useful information.
Author | ch, passion for improvement.

