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Lol, changed cables…all good :). Thanks for your help

Thanks for the reply buy I mistakenly flashed Android before I removed graphene key. Installation failed. Then I finally got the graphene key removed. Now when I attempt flash to flash stock google, it fails - does not contain product sig - sending product - failed invalid argument

Had grapheneOS on pixel 3xl and needed to return to stock. Have done this before with other phones, so I just did it, however, I forgot important step :( I forgot to remove "non-stock key" before I flashed stock Google. Of course flash failed, now I cant get anything installed, even graphene. Any ideas???? Thank you