The "To Keep Up" Wiki

ref: https://www.manualslib.com/manual/620756/Zoom-H1.html

1. While pressing the red record button, turn the power on.¹⁾
2. Use the « and » buttons to set the month.
3. Press >/|| to move to day.
4. Repeat preceding 2 steps to set values for day, year, and time.
5. Press red record button to return to the previous item.
6. After setting the last item, press >/|| to finish.

If a microSD card that is not properly formatted is inserted into the unit, the screen shows ForMAt PrESS

1. Press the red record button to format the card.
2. Home screen appears after the card is formatted.

You can also get to this screen and reformat a MicroSD card by pressing the trash button while turning the power on.

You would upgrade the firmware when necessary. Check the firmware version when the unit is starting up. Version 2.10 is shown as 2/10 above the HI when powering on.