HP T250 - Manual (Page 80)

6.5.10 File Number(Default: Series)
This setting allows you to name the files. If “Series” is selected, the
file name will follow the latest stored file consecutively. If “Reset” is
selected, the next file name will start from 0001 even after formatting,
deleting or inserting a new memory card.
1. Power on the camcorder.
80
2. Touch the icon or press the Menu Button ( ) then
touch the Settings icon . Touch the File Number option to
display the submenu.
3. Touch the desired option.
4. Touch the icon to exit the Menu mode.