Charge 4 hasn't receive firmware version 1.100.43 - Fitbit Community
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Did I just brick my Fitbit? Followed instructions for the firmware update, had a full battery and kept it next to my phone. Firmware update failed and now my Fitbit is stuck
Solved: Charge 4 Firmware Update - 1.100.34 - Fitbit Community
Blaze Firmware Release - 17.8.301.8 - Fitbit Community
Fitbit OS 3.0: what's in it and how to install it - Tech Advisor