Restore an Account using JSON backup file
For Polkadot native wallet (Substrate account) only.

Export account from Polkadot {.js}

Click on the vertical ellipsis next to the Polkadot account that you want to export, then choose Export Account. You will receive a JSON file which you can import into SubWallet.

In a newly installed SubWallet

Step 1: During installation setup, click Restore account from backup JSON file.
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Step 2: Insert your JSON backup file that you exported from Polkadot {.js}. Enter your password and hit Restore (You need to remember the password you have set before for this account). Your Polkadot wallet is successfully imported!
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In an existing SubWallet

Open SubWallet extension and click on the round favicon icon in the top right corner. Then hit Restore account from Polkadot {.js} and repeat the steps. This instruction applies to Polkadot native wallet (Substrate account) only.
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Export account from Polkadot {.js}
In a newly installed SubWallet
In an existing SubWallet