LG G4 stuck on firmware update - G4 Q&A, Help & Troubleshooting

My LG G4 doesn't boot into download mode and LGUP doesn't recognize it. Whenever I power on my phone it boots to firmware update screen and it says: 633A B100 modified. The problem is that I can't do anything. I can't go into download mode or recovery.
This question is similar but I can't find the solution.
https://forum.xda-developers.com/g4/help/lg-g4-stuck-firmware-update-screen-t3675998

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http://forum.xda-developers.com/sprint-lg-g3/general/guide-fix-hard-brick-recovery-guide-t3132359

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