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I can boot the latest Raspberry Pi OS on my Raspberry Pi 3 B+ with no issue by downloading this image and flashing it to an SD card: https://www.raspberrypi.com/software/operating-systems/

Now I want to build this old project on this Raspberry Pi 3 B+: https://github.com/google/aiyprojects-raspbian/releases/tag/v20210402 Using the same SD card and the same Etcher application the RPI refuses to boot, gives a 4 long 7 short error (invalid image: start.elf and kernel not found, power issue type B).

Curious, I flashed the Buster image I believed the project is built on to the same card with same app (this image: https://downloads.raspberrypi.org/raspios_armhf/images/raspios_armhf-2021-03-25/) and I get the same 4/7 error.

I consulted this page on troubleshooting: https://forums.raspberrypi.com/viewtopic.php?p=437084#p437084 I have the feeling that this Buster image compatible with RasPi3 but not RasPi3B+?

If that is the case, what image should I use to rebuild the project as described in https://github.com/google/aiyprojects-raspbian/blob/aiyprojects/HACKING.md ?

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    You could still flash Buster to a Pi3B+ (if you can find one) and it should still work. Frankly I wouldn't bother as Buster will shortly be archived. Commented Jun 3 at 6:47
  • See LED Warning Flash Codes 4 long 7 short indicates Power failure type B but it is unclear if this applies to old models. Commented Jun 3 at 7:25
  • 3B+ is capable of booting from USB - does it? though, re-reading the question it's probably not a valid thought - seeing as a bookworm image runs fine as far as you've said Commented Jun 3 at 8:09
  • Thanks, @Milliways I did find that error code but seeing that the device boots fine with a later image I do not think it is a power issue. Commented Jun 3 at 8:14
  • Thank you @Milliways I edited the question for clarity, changing "latest Raspbian" to Raspberry OS which is in fact bookworm, also added URL. Commented Jun 3 at 9:46

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