Hello, I said, I installed the TWRP + LK.IMG in my version 1.4 and there was softbrick. .
Then I installed the TWRP in version V1.2 plus the LK.IMG included in the package and there was again softbrick. .
Then install only the TWRP included in your link and NOT the lk.img in version V1.2 and eureka, it worked perfectly, delete data twice and then decrypt in mobile, restart in TWRP and flashing Magisk and after all that process, reboot into System and then back to TWRP to make the backup that came out perfect.
The biggest problem lies in the LK.img file, which must be of the same version as the stock, otherwise softbrick.
The LK.IMG file removes the inscription Orange and a 5sec delay when the system boots. The LK.IMG file I gave from version 1.3 for version E
In any case, TWRP booted up and you made a backup copy of the phone. Have you tried to restore some part of what you saved? For example, Date or any other small section. How does the reboot process go to the System?