In case you arrived here because this topic is kinda visible…
U1 Supercharged firmware and toolkit do not exist anymore.
I developed them not knowing that @paxx12 and an awesome group of folks have been working together on literally the same thing.
They graciously invited me to join them and I’ve been happily contributing to paxx’s firmware ever since.
Please use paxx’s firmware, not this one.
Forum topic: Custom Firmware for Snapmaker U1 - Enhanced Features & WebRTC Camera
Docs: https://snapmakeru1-extended-firmware.pages.dev/
Repo: GitHub - paxx12/SnapmakerU1-Extended-Firmware: Custom and repackaged Snapmaker U1 firmware
Find us on Snapmaker Official discord server (you can search for it in Discord server browser)