E:/ failed to mount in TWRP (bootloop) - G4 Q&A, Help & Troubleshooting

Hi guys!
I would need some more help with my G4. I flashed a sound mod (xtreme music) and my LG G4 got stuck in a bootloop, so I decided to restore backup, which wasn't possible because of the e/ failed to mount.
I factory restored the phone, but because of the problem I still cannot install the custom ROM again.
Any help would be appreciated. I can enter TWRP and download mode, so I guess flashing a stock KDZ is still possible.
Thank you
EDIT: H815 EUR Version with Genisys 3.7 installed

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