[sosthenisRR]

I have followed the guide to port twrp to my device. 
https://forum.hovatek.com/thread-21669.html
I don't know what steps I need to do in what order after porting. Flashing directly after port doesn't work at all and signing twrp then flashing leaves an empty recovery completely. Bootloop at boot recovery using adb and hard keys each. Do I need to patch twrp with my signature pem file? Or do I need to flash a blank vbmeta file before I try to flash ported twrp? Running Android 9.0

[X3non]

I have followed the guide to port twrp to my device. 
https://forum.hovatek.com/thread-21669.html
I don't know what steps I need to do in what order after porting. Flashing directly after port doesn't work at all and signing twrp then flashing leaves an empty recovery completely. Bootloop at boot recovery using adb and hard keys each. Do I need to patch twrp with my signature pem file? Or do I need to flash a blank vbmeta file before I try to flash ported twrp? Running Android 9.0

root first (you have done this already), then delete recovery-from-boot.p file within /system partition using a root file manager

recreate a custom vbmeta with custom key for recovery same as you did for boot ie the new vbmeta must have custom key for both boot and recovery and you can use the same key you used for boot

port twrp then sign using avb tool (same way you signed patched boot)

flash the new vbmeta
flash the signed twrp
boot to twrp using button combo or using adb reboot recovery

[sosthenisRR]

I followed all guides. Regenerated custom vbmeta Ported and signed twrp.Flashed vbmeta then  Flashed signed ported twrp using fastboot. Tried rebooting into recovery using fastboot and hardkeys and yet the screen stayed on the load screen for over 10 minutes. I'm following the guides to 100%.what am I missing...

*Edit*
Do I need to port twrp then patch twrp image with magisk then sign or patch recovery then port twrp and sign? I am sure there is a step that I'm missing.

[X3non]

I followed all guides. Regenerated custom vbmeta Ported and signed twrp.Flashed vbmeta then  Flashed signed ported twrp using fastboot. Tried rebooting into recovery using fastboot and hardkeys and yet the screen stayed on the load screen for over 10 minutes. I'm following the guides to 100%.what am I missing...

from homescreen, the command "adb reboot recovery" gets your device stuck at bootlogo? and you can confirm that you renamed the recovery-from-boot file?
you'll need to explain exactly what you did and the commands you used OR better still you might want to take a screenshot of the cmd window