After owning a RPi 3 for almost a year now, I wanted to do a complete clean installation. I had installed Raspbian on a USB-stick, which was really easy at that time. I just had to write the disk image on the USB stick using "Win32DiskImager" and then I had to move the root partition to an sd card. Finally I had to change the root path in the `cmdline.txt`.

But however when I tried to do the same yesterday, the Pi didn't boot up.

After some research I found [this](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#usb-mass-storage-boot).
I followed the steps and almost everything worked fine. Instead of using `/dev/sda2` in the `cmdline.txt` I had to use the partuuid of my dev partition.
After rebooting and removing the sd card, I just got a black screen.

Then I found [this pull request](https://github.com/raspberrypi/documentation/pull/616) which updated the manual. After following the updated steps, I got the same result as before. The pi wasn't booting, and the green led on the board remained off.

How can I get my RPi to boot from the USB stick?