WRITE DOWN YOUR QUESTIONS AND WE'LL SOLVE :)
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Base thread: https://4pda.to/forum/index.php?showt...
1- Rollback from Android 9/8 to 7: https://4pda.to/forum/index.php?showt...
2- Bootloader unlock: https://4pda.to/forum/index.php?showt...
3- Unlock Bootloader (optional step, you can also do this from 8,9 after unlocking bootloader) https://4pda.to/forum/index.php?showt...
4: You can upgrade to Android 9 via OTA (from settings) as long as you have STOCK RECOVERY, therefore it's a bad idea to install twrp as step 3, but you can reinstall stock recovery if you want.
5: TWRP, STOCK RECOVERY
https://4pda.to/forum/index.php?showt... (look in RECOVERY section)