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For us using keystore account, we have a lot of limitations on Hive. Keystore account can't access other Hive frontends.

Actually, you can if you know what you're doing. Have you saved the 12-word secret phrase of your keystore? If so, that would be the master password of your HIVE Account. I already tried to sign in to Keychain Wallet using mine, and it worked.

https://hive-keychain.com/

Yeah, I had my seed phrases saved, I will try what you said to see if it works for me.