I deleted 500 MB partition. I thought it was a leftover swap. It wasn't.
I deleted it with Windows 10 Disk Management.
I could not boot pass the ZorinOS logo.
I tried to fix it by making the unallocated partition into 500MB Fat32 with Windows 10 again but it won't work.
I tried recovery mode in Grub with timeshift
which included the grubloader recovery as well. It did not help me either.
What else can I try?