You don't that's the best part of it!
You can try to reset your iCloud password https://iforgot.apple.com/ If that doesn't work either then it's a paperweight and you can sell it for parts
You can try to reset your iCloud password https://iforgot.apple.com/ If that doesn't work either then it's a paperweight and you can sell it for parts
C'mon! It can't be that dire... at worst you should be able to reinstall or reset to factory defaults somehow. Granted the data may be lost, but the whole is still more than the sum of its parts :-)
You may have to remove the disk or use a JTAG programmer, or heck... maybe even re-solder something.
The more nuanced question in these situations isn't "is it possible" but "is it economically viable".