If you’re trying to set up FlowCrypt on a device but have at least one another where you can read encrypted emails, use that device to go to FlowCrypt Settings ⮕ Security ⮕ Change passphrase. It will let you change the passphrase without knowing the previous one. This will then allow you to use the new passphrase when setting up another device.
If you’re unable to read encrypted emails on any device without the passphrase anymore, you won’t be able to read previously encrypted emails regardless of what you do. To set up everything again, you can go to FlowCrypt Settings ⮕ Additional Settings ⮕ Experimental ⮕ Reset account. Then, during the setup process, if you enter an incorrect passphrase, the system will allow you to set it up again with a new passphrase for future emails.