Bitboy by Justin moon led me to specter diy,

Specter founders showed me SeedSigner.

I always mention Specter DiY in my posts, but one thing that limits me from recommending it more is that you have to connect to a PC to install the firmware - which is why they pointed me to SeedSigner if my memory serves me correctly.

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Tru you have to mount the internal storage as a drive to install the initial firmware.