@SageSoft @OS1 I think that the eeprom update ‘default’ is now also one that plays nicely with PCIe/NVMe setup, but like you’ve discovered, you can go into raspi-config at terminal and choose ‘latest’ bootloader instead of ‘default’.
I’d definitely start with an SD card made with version 1.8.4 of imager and using the latest RPi OS for RPi 5 64-bit. This should be the top option when you choose Raspberry Pi 5 in the new board filter in Imager.
From there, I’d boot the RPi 5 from the SD card with the NVMe Base and NVMe installed, and use Imager in RPi OS to install onto the SSD.
If it can be seen and works fine in Imager, then there should be no barrier to booting from it with a recent OS image and if ‘NVMe boot’ has been chosen in raspi-config via terminal.
If all that is fine, and you’re still not able to boot from it, with or without the SD card, then something else is probably afoot.
There are a few levels of ‘non-boot’ that indicate what might be wrong:
Grey/Red/no sign of life at boot: The drive and RPi are very upset with something. Hope the power button down to turn off and try again.
Stuck at the bootloader (black screen with raspberries and a little bit of text) which tries NVMe/SD on 10 second cycles: bootable partition not found. If you wait and watch the text, you can see it reporting if it can see the NVMe, and if it can see partitions, but not boot from them.
Stuck at ‘busybox’: The system found a bootable partition, but then couldn’t make the transition to the full boot image. This is probably something that went wrong with imaging the drive, or you’re using a weird OS, or tried to manually partition and install the OS or similar.
Booted into SD card despite NVMe being the first boot option: The bootloader didn’t find a bootable partition on the NVMe, or could not see the NVMe at all during boot.
I think that’s a summary of the main symptoms I’ve seen, and they can have many causes from the cable being not quite seated correctly, dust in the connector, RPi or NVMe drive not happy with each other for some reason, or something not up to date or right with the software side.
I’ve tested the Kingston NV1 and KC3000 successfully, but not the NV2, so I’ll get one of those to try. It may be a power-hungry NVMe, or have other quirks.
If you’ve definitely got the latest (Jan 5th 2024) EEPROM, definitely installed the latest OS, and reseated the cable a lot, then you should send a photo and the model/exact drive SKU to support@pimoroni.com and we’ll see what we can suggest to get you up and running. We’re quite overwhelmed at the moment, but we will get back to you :-)