where to put os_check in bootconfig.txt for a pi5 to boot using usb ?

I tried the top then i tried the bottom. I also read something about usb_boot=1 ... any help would be apreicated. I have a new boot loader and it seems to be working but still prompts for os_check=0. TIA

im trying to run diet pi btw

i got it solved i installed ubuntu 23.04 it picked up the nvme usb c drive fine its lovely

Not sure how to mark this as solved

!solved

solved!