You may find some tipps in:

Additionally you may need to test with
ls -lA /boot
what is missing.
And with
LANG=en; sudo mhwd-kernel -li
what kernels are meant to be there
Then install one additional kernel (one that you did not have before)
LANG=en;sudo mhwd-kernel -i linux612
and
LANG=en;sudo mhwd-kernel -i linux611
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