The 3b+ enables the mass storage and network boot options by default. To set that bit requires a special SD card. The Raspberry pi 3B adds USB mass storage and network boot options but unfortunately they need to be enabled by setting a bit in the one time programable memory on the SoC. If there are already Pi boot files on the SD card then I belive you may have to be careful when you insert it since the Pi A series don't have the special circuitry to suppress the SD card interface that the compute module has. ![]() You can find instructions for the compute module flasher utility at. That basically leaves you trying to connect a keyboard and mouse via Bluetooth. You could always use a USB extender hub, but then that's more to carryincluding another power supply. On a model A, A+ or Zero I belive you can use an appropriate USB cable (A to A for the A/A+ A to micro B for the Zero) cable along with the flasher utility intended for the compute module. The Zero has a limited number of USB connectors on boardjust one, if you allow for the power connector, which obviously means you have limited connection options. You may well find that you can use a camera or an older smartphone as a card reader (newer smartphones tend to use MTP rather than mass storage, so they are not suitable for this) to write your card. ![]() ![]() The only things these models can boot from out of the box is a SD card. On a B, B+, 2B or 3B you can't do it without something to write the SD card.
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