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This hardware wallet is sadly not like Blockstream Jade which is completely open source software + hardware.
You can’t verify the software on Ellipal or even see its complete code. it could 100% have a backdoor and no one would know sadly.
All you can do is ask Ellipal support to open source it completely.
Another thing is allow multi-sig which requires multiple wallets or sigs to send transaction. That way you can use Ellipal + 3rd party for more safety
Sadly Ellipal is one of the worst in this regard but I hope they change as they would be the best if they did it