I'm booting from NVME but I want to switch back to eMMC

[acruhl]

These are the rough steps I took to get where I am:

1. Started with Manjaro working fine from eMMC
2. Installed NVME disk
3. Copied eMMC to NVME (using dd)
4. Installed tow boot to SPI
5. Booted, interrupted boot and chose NVME

This worked. However, now I want to boot from eMMC again. I rebooted and chose the eMMC option in tow boot, but it doesn't work.

I now have /boot mounted from the eMMC and / mounted from the NVME.

I used blkid and noticed that the UUID for my eMMC partitions and my NVME partitions are the same (because they would be, I copied form eMMC to NVME) and I assume this has something to do with my problem.

What should I do to boot from eMMC where / is also mounted from the eMMC?

I have thought of:

1. Physically removing the NVME disk
2. Using dd to wipe out the NVME disk

But I'll wait for an answer.

(I booted Fedora on a MicroSD to type this, this works fine.)

Thanks.