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Scott Alfter wrote:
> In article ,
> Theo wrote:
> >If you have a non-Lite board there's a way to flash the eMMC externally (via
> >USB I think). If there is onboard eMMC the SD slot is not connected to the
> >Pi (or maybe to the second MMC channel, not sure).
>
> There's a tool called rpiboot that you use to flash a CM4. Most carrier
> boards have a switch or jumper to enable or disable eMMC boot. Set it to
> disabled, then connect it in to your computer. Running rpiboot sends over a
> small program that causes the CM4's eMMC storage to show up as a USB storage
> device. At this point, you can use the RPi Imager, dd, or whatever to blast
> software onto it the same way you'd load up a MicroSD (or SD) card for other
> Raspberry Pis. When done, unplug it, set the switch or jumper back to
> enabled, and power it back up.
If you can boot the CM4 by any means, that also allows you to run an EEPROM
update to upgrade the firmware on the CM4. It's possible the board has old
firmware which won't boot new images or carrier boards, and doing an update
might imorove matters.
Theo
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