Unlocked P9 Lite stuck at boot

[Bounty Hunter]

So I wanted to root my phone (P9 Lite with Nougat). It was my first time so I found a step by step tutorial and used it to progress. After a load of time I finally was able to unlock it, then apparently, I was supposed to install TWRP. Failed a few times then I understood that TWRP version was for marshmallow, so I searched for a version compatible with nougat. Found one, installed correctly, file was transferred. Anyways when I tried to boot TWRP it would not work, it would boot in normal mode. I tried 2 more versions TWRP and it was the same. All that Power button + one of volume buttons **** was not working. So I thought, maybe I just overdone it, with many different versions of TWRP. So I decided to factory reset it. I rebooted my phone, now it is stuck at 'Your device is booting now' and I am frustrated as f**k. Not mentioning problems with unlocking, this whole process was really annoying, been doing this **** for 4 hours straight. Would like to receive some help if anyone got some. Let me know if there is something more you need to know.
Thanks in advance.

EDIT: Tried reinstalling img failes and relocking bootloader using https://forum.xda-developers.com/hua...t3539696/page4
Now the phone is stuck at ERROR MODE, Attention! Please update system again
Error!
Func NO: 11 (recovery image)
Func NO: 2 (load failed!)

 

[James L]

There's a few different ways to fix this device. Is the bootloader locked or unlocked currently?

Also as far as i know there isn't a twrp recovery for that device with nougat firmware, there is a working recovery though.

 

[Bounty Hunter]

I unlocked bootloader while attempting to root and then after fails I re-locked it. Now I even can't boot it in fast boot mode. Only that one error screen pops out.

Currently bootloader is re-locked.

 

[James L]

Have you tried extracting the firmware and putting the Update file from the firmware on the SD card, then doing the three finger button press?

 

[Bounty Hunter]

I will try it asap. Don't have sd card rn but I will get one.

 

[suprianto]

how to extracting the firmware? and where i can download the firmware?
thanks