The Raspberry Pi 3B+ and also the "Pi Zero 2w" support USB mass storage boot out of the box.

[jeanrocco]

The official documentation should be corrected and mention that the Pi Zero 2W can boot from mass storage out of the box, no SD inserted and no OTP bit setting required, exactly like the Pi 3B+ does.

I know, I boot mine from an SSD on a usb adapter: just flash the OS to the SSD, using "Disks" on Mint ... since the Pi Imager won't recognized the SSD drive.

jrb.

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[jeanrocco]

On a brand new Pi Zero 2 W, the command:

vcgencmd otp_dump | grep 17
17:3020000a

which means the OTP is already programmed to enable USB host boot mode, but the 2 W will also still boot from an SD card.

The documentation is confusing and should treat the 2 W differently: you don't have to touch the OTP bit as it is already set, but it is still possible to boot from an SD card.

In other words the doc. should say:

Raspberry Pi 3B+ and Pi Zero 2 W

The Raspberry Pi 3B+ and the Pi Zero 2 W support USB mass storage boot out of the box.

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The documentation reads:

Raspberry Pi 3B+

The Raspberry Pi 3B+ supports USB mass storage boot out of the box.

Raspberry Pi 2B, 3A+, 3B, CM3, CM3+, Zero 2 W

On Raspberry Pi 2B v1.2, 3A+, 3B, Zero 2 W, and Compute Module 3 and 3+, you must first enable USB host boot mode. This allows USB mass storage boot and network boot.

Note	Raspberry Pi 3A+ and Zero 2 W do not support network boot.

Use any SD card flashed with Raspberry Pi OS to program the OTP bit.

To enable USB host boot mode, add the following line to config.txt:

program_usb_boot_mode=1

Then, use sudo reboot to reboot your Raspberry Pi. To check that the OTP has been programmed correctly, run the following command:

vcgencmd otp_dump | grep 17:
17:3020000a

If the output reads 0x3020000a, the OTP has been successfully programmed. If you see different output, try the programming procedure again. Make sure there is no blank line at the end of config.txt.

You can now boot from a USB mass storage device in the same way as booting from an SD card. See the following section for further information.

Raspberry Pi 3B+

[lurch]

Now fixed. Thanks!