OnePlus 7T Unbrick - Return to Stock, TWRP Recovery ROM flash and Root (6, 6T, 7, 8)

Because flashing custom ROM over fastbootd can be confusing for some people, and after your requests, I have uploaded another tutorial.
Step by step guide on how to restore your OnePlus 7T to stock settings, how to flash TWRP recovery and how to flash Custom ROMs with it.
In the end, I have also explained how to Root your device.
This method to return to stock is confirmed to work on 6T and other OnePlus models (but you need different files of course).
XDA Thread with MSM Download Tool - Download the right version for your Device and read carefully:
https://forum.xda-developers.com/t/op7t-oos-10-0-16-15-hd65aa-ba-unbrick-tool-to-restore-your-device-to-oxygenos.3994835/

TWRP Recovery:
https://drive.google.com/file/d/1hj4-ZsZjHfVuyoPpKi_noofo4f_DPOz0/view?usp=sharing

Magisk:
https://magiskmanager.com/#How_to_Install_Magisk_Latest_Version_220_on_Android_Custom_Recovery_Option

Custom ROM used in the Video:
https://forum.xda-developers.com/t/11-derpfest-for-7t-beta-official.4214727/

Instagram: EdinK_Tech
https://www.instagram.com/edink_tech/

Music used: Calvin Harris - josh pan

Video is recorded with OnePlus 7T and Xiaomi Mi9T with Filmic Pro app.

Видео OnePlus 7T Unbrick - Return to Stock, TWRP Recovery ROM flash and Root (6, 6T, 7, 8) канала EdinK Tech