Fitbit Zip won't sync

[Tiaria]

My zip has not synced since January 29, 2019.

Moderator edit: updated subject for clarity

[SteveH]

The usual things to try when you get syncing issues are:

• restart phone
• restart fitbit using this procedure: https://help.fitbit.com/articles/en_US/Help_article/1186/
• restart fitbit a few more times (it doesn't always work)
• "forget" the fitbit in the phone's bluetooth settings
• go through fitbit's troubleshooting guide at:  https://help.fitbit.com/articles/en_US/Help_article/1866/
• if none of that works then contact customer support: contact.fitbit.com

Note that fitbits only have limited memory to hold data between syncs, usually around 7 days. After that they start to hold data at a daily summary level and after around 30 days of that they start to delete data. So, once you get your syncing issues resolved your data will look strange.