> Without much deep knowledge about kernel processes, I found the following 
> line in the log:
> 
> [ 0.179076] Initramfs unpacking failed: ZSTD-compressed data is truncated
> 
> May this be a hint towards the reason why the rootfs couldn't be found?

Doh! That is indeed the smoking gun (how did I miss that? Skimmed too
quickly this morning). That suggests something has either gone horribly
wrong with generation of the initramfs itself (a dracut issue), or
something went horribly wrong when copying assets to the boot partition.

@irihapeti: could you run "sudo flash-kernel" and check if there's any
obvious errors in the output? That would show if the new initrd.img is
getting truncated (e.g. due to lack of space on /boot/firmware)

Also, could you paste in the output of "df -h" and "ls -l
/boot/initrd.img* /boot/firmware/*/initrd.img" ? That should if there's
a discrepancy between the copy of the initrd.img under /boot (the
original on the root partition) and the copy on /boot/firmware (the
actual boot 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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