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When you’re connected within the Curve interface, do you have any other crypto/web3 applications open (including Ledger Live)? You’ll want all of these closed when you try to swap your stETH into ETH using Curve – they may be fighting for connection with your Ledger.
Ideally, everything should be closed except for Curve, and your plugged in Ledger with the „ETH“ app **open**. You’ll also want to make sure blind-signing is enabled from within the ETH app’s settings when you do this.
It may be worth a try disabling any other wallet extensions you have installed (if you do) for the time being, they may try to overpower Curve for connection to your Ledger (leading to this „approve transaction“ error).