I've prepped the USB stick in the Pi by fdisk, wiping it so it's fresh, then making a windows-compatible partition 8G (you have to do this so your laptop will recognize it so Win32DiskImager will work), then write the .img to that.
According to the instructions on the "USB Boot" instruction page, which I believe I followed exactly, it should boot but it doesn't. Did I forget to do something? Isn't it implied that once your Pi 3B+ has the OTP bit set it will boot from a USB which has the image?
I verified the cmdline.txt the imager wrote corresponds, and the partuuid belongs to the proper USB partition, to wit:
I viewed the devices, comparing the filesystems on the SD card which it successfully boots from (mmcblkp0 and p1) and they correspond almost identically to the /dev/sda1 and sda2, and have the same data in them (when mounted so I can ls -al them)
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dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=PARTUUID=7ee80803-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet init=/usr/lib/raspi-config/init_resize.sh
I don't understand what I'm doing wrong or left out.
Let me know if there's something you need to look at, I'm stumped. BTW I've re-done this "exercise" several times just to make sure I'm following the instructions. Thank you ---