Guarda has an option to export the wallet. It does not use seed phrases but it exports the private keys to a file. Export it without a password or encryption and then use a hex editor to scan for private keys inside the backup file.
when I export, I get a totally different address. sometimes when I try to send trx to my guard address, it says its invalid.
there is something abnormal about this app
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Which wallet app did you use to import your wallet and are you completely sure you chose the correct coin when exporting the private key? Better import the pk into a different wallet instead of Guarda.
I read some complaints on reddit about Guarda not showing the transaction fee which makes it impossible to finalize and broadcast the transaction. So, it seems like a common issue with this wallet.