I want to relink my BTC address to different byteball address
You can still do this, but move your Bitcoins to a different Bitcoin address, and link that new address to your new Byteball address.
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But the wallet is same despite the different payment address.
I mean, I made the micropayment-for-linking to different byteball address from the single hardware BTC wallet (Ledger nano) but chatbot told me it was paid from different address.
There's no problem if, as you said, previous link become invalid, but worried if the later linking is also invalid without any notifications.
Sorry for my bad English from Japan, but I want to get involved in this exciting coin.
Best regards