Fitbit Charge 4 gains new features with firmware update
Why can't I update my Fitbit device?
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
Fitbit Charge Users Report Worse Battery Life After Firmware Upgrade – Consumerist
The Most Recent Update For The Fitbit Charge 5 Includes The "Find Phone" Function | IWMBuzz