UF2 file creation and editing

Well will probably stick my foot in my mouth, and maybe have not looked hard enough. I would like to edit the UF2 file that came with my PicoBricks unit from robotistan, it is the Zero to Hero kit (seems I am still a Zero, but am working on it). When I first booted up my Pico, it had the OLED with a number of items displayed, Temp, Potentiometer Voltage Feed Back, IP address and there may have been another item.

When I nuked my Pico with the UF2 file from RPi for the Pico the system reset and now I do not know how to get that UF2 file back, or where to get it or if I can create it myself. It would seem that MS Maker is an option but what is the best way to go about this, would like to delve into the Start from The Start.

Or am I overthinking this whole gig? :-)