When I bought my Series 9 Apple Watch a while ago I never got around to selling the S7 it replaced. Instead I use the S7 when the S9 is charging.

Last night I left the S7 on the bedside table and when I picked it up this morning it told me I'd tried too often to enter the wrong password and to wait 8 hours to try again.

Turns out this has often happened to people and the solution is to do a full reset.

Resetting …