See readme: https://lab.flipper.net/apps/picopass/
git clone https://gitlab.com/bettse/picopass.git
cd picopass
git submodule init && git submodule update
ufbt
brew install asn1c --head on macos)asn1c -D ./lib/asn1 -no-gen-example -no-gen-OER -no-gen-PER -pdu=all sio.asn1 in in root to generate asn1c files