NU7 retires Tx V4. The Zondax shielded app on Ledger can only produce this type of transaction.
Remember to move your Sapling funds out of their app before NU7 activates otherwise you will have to use your seed phrase.
Let me translate it for civilians:
Zondax will not work after NU7 (it is unable to generate new transaction versions). Better move money to another wallet.
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