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Hi @Philsnyder, welcome to our Fitbit Community! I'm sorry to hear that your Charge 3 stopped syncing with your mobile device. I totally understand how you feel about this.
Regarding your question, I'm afraid that the previous firmware version can't be installed. However, I'd like you to try the troubleshooting steps that are listed in this help article in order to fix the syncing issue. After trying these steps, monitor your tracker for the next 24 hours and see if it syncs properly.
Keep me posted on the outcome.
Best Answer