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Thanks for your help with this. When you say "move your bitcoins somewhere else"... can you give me an example of where? I have a ledger nano, multiple exchange wallets, MEW, etc...

I mean by that, that you have to make sure that all the addresses where you are going provide the private keys to Bither must not contain bitcoins any more. I do not use any hardware wallet, so I cannot help you with that. MEW if for Ethereum only ...
I believe you can use Electrum and create a new wallet connected to you ledger nano ....