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My camera doesn't work. I already tried downloading different camera applications but none of them worked. Problem is physical not software-related. How can I login to Whatsapp Web without scanning the QR code?
You can't, you need to scann with Whatsapp, if you scann the QR code with a normal reader, how a website or similar, you only get a plain text.
Whatsapp send that text to your own server to enable you a session in your browser.