How to fix: Raspberry Pi 3 Model B+ bootup hangs with the ACT led flashing 8 times

Raspberry Pi bootup hangs with the ACT led (green light) flashing 8 times.

According to R-Pi Troubleshooting, 8 flashes means the SDRAM not recognised. You need newer bootcode.bin/start.elf firmware. If start.elf won’t launch, it may be corrupt.

So what I did, I opened the micro SD card up on my laptop and searched for start.elf. I then deleted it and replaced it with a new start.elf found here: https://github.com/raspberrypi/firmware/blob/master/boot/start.elf.

Insert the card back into your Pi and it’ll bootup as normal.

This fixed the issue for Raspbian Stretch and Ubuntu MATE.

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