Hello,
Im facing bootloop on every custom rom Ive tried. I have no idea why. I have unlocked bootloader and twrp installed. I always clean flash (wipe data, etc). I have no idea why 
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Ok when u flash a custom rom u need the op7 pro firmware and modem /vender step one do a full wipe system data cashes davlic cashes step 2 flash firmware modem /vender step 3 flash custom rom of choice step 4 flash gapps then reboot system then reboot recovery and flash adons magjsik root etc
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Here try this one it’s easier do not flash gapps
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U can do a format data after/ factory reset after flashing oos to both slot a and slot b.
Copy other files over after you format data
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Oh,
Thank you, now I know. My last rooted phone was HTC 10 and boy it wasn’t process like this back in days 
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