> Before I reboot now with fingers crossed, I need to know - Dave - what
did you mean with 'copy it to the boot partition' in your instructions.
Thx.

Sorry, I should've made that clearer: that's what the call to "flash-
kernel" does.

The kernel package, and the generated initramfs exist under /boot. But
despite the name, that's *not* the boot partition, it's just a directory
under the root partition.

Abstractly, flash-kernel's job is: take the boot assets (kernel,
initramfs, possibly device-trees and boot scripts) from wherever they
are and copy them wherever they need to go to actually boot the device.
On some (non-Pi) devices that's an android boot partition, or it could
be an MTD, but in the case of the Pi it's as simple as "copy to that FAT
partition".

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https://bugs.launchpad.net/bugs/2155094

Title:
  RPi 3B, Zero 2W, 4B: New boot assets in /boot/firmware/new failed

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