Sending old runs from my F3 to my new F5x

Been using a Fenix 3 till Thurday when i picked up an F5. ;)

So far so good, first run in the can and all seems ok.

BAck home and I want to upload my PR's and some usual routes I run onto the F5.

Using Garmin Connect I successfully pinged the PR's over to the new watch but it refused to send old routes over to the f5.

Using Garmin Connect i went into find the required activity, click on the sprocket symbol for settings, selecting send to device from the cascade menu.

Everything cycles through GConnect and it syncs but no old activities on the F5x

Any light shed mucho aprreciado