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Hello,
Thank you for reaching out to Ledger Support.
I understand that you would like to manage THETA with your Ledger device.
Note that THETA has moved to its own blockchain, which is different from the THETA ERC20 token initially launched on the Ethereum blockchain. There is currently no available THETA app in the Ledger Live app catalog. However, as THETA mainnet use the same address format as Ethereum, you should be able to manage THETA with your Ledger device and the ETH app by connecting your Ledger device to the Theta Web Wallet.
You can follow the instructions in this article for step-by-step instructions: https://medium.com/theta-network/theta-web-wallet-adds-support-for-ledger-trezor-hardware-wallets-a11ace6d2799
Regarding the address, you can select any address from the list since all these addresses are linked to your 24 words recovery phrase.
If you face any issues to use the Theta Web Wallet interface, please reach out to the THETA community on Discord as we can not provide assistance with this.
Note that when you use the Theta web wallet, you are only using their interface. Your private keys remain secured by the Ledger device.
As these instructions are coming from THETA and there is no THETA app that has been officially approved by Ledger, please exercise caution by testing first with a small amount. Ledger cannot be held responsible for any possible issues that could occur while using the Theta Web Wallet.
I remain at your disposal if you need further assistance or clarification from my side.
Warm regards,