I agree that these devices are very shitty...especially for the price. But I'm not sure how to transact in self custody with only seed words and no device. I didn't realize I was a noob.
You just enter 12 words in a wallet and you get access to your money.
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That seems like the best option. Lol.
and then your keys are no longer cold and you will have to generate new seed to get back to cold
build a seedsigner and keep your keys cold