Could not import data from "kwakka.bin": Invalid argument

[Jomme5]

Tried this

efivar --import=kwakka.bin --name 8be4df61-93ca-11d2-aa0d-00e098032b8c-Boot0000
and this

efivar --import=kwakka.bin

File was exported before with the same tool.
Minor changes on file contents were made with ghex.