Zip won't sync to my iPhone 7

[Jjaya]

my Fitbit app on iPhone 7 says it synched but the steps are not showing. I have toggled the Bluetooth, taken and RE inserted the battery, reinstalled batteries, restarted iPhone but nothing is working. It was synching until 2 weeks ago.

please advise

Moderator Edit: Clarified subject

[SunsetRunner]

It's time for a new tracker. This has been out of production for many years now and so has your phone.

[Rich_Laue]

Log out/in on your app. 

Clear the apps cache.l/data. 

Restart the phone/zip

[Jjaya]

There is no log out showing in my fitbit app on iphone. I can remove the zip. 

How do I clear the apps cache.l/data on my iphone. 

Your reply would be greatly appreciated.

[Rich_Laue]

I'm on android @Jjaya try using Google. 

Or ask on the iOS board.