Hex files and how to convert them to bin

[VaZso]

that explains it, I was trying to download 2.16 onto the pinecil

So... I have updated my Pinecil to official v2.16

My host system (Debian 11) contains dfu-util v0.9 which I think is too old to correctly handle .dfu files come with IronOS image.
(Latest version is 0.11)

So here is the command what I used to convert .hex to .bin to upgrade my Pinecil using the old way:

objcopy --input-target=ihex --output-target=binary Pinecil_EN.hex Pinecil_EN.bin

So, that is the answer for @turbothewolfhog's initial question.