Could you help me how to return to the Stock ROM of Lg g8x 850UM from Sprint I have a custom ROM on my device help please

[Panameno503]

Necesito ayuda con mi equipo se ha quedado en una custom ROM la lineage OS 19.1 y quiero volver a stock estoy haciendo el procedimiento habitual pero no entra en modo descarga porque tengo TWRP y root pero no me permite entrar en modo descargar ni en modo emergencia ayuda por favor

Mod edit: English please!
Google translation:

I need help with my computer it has stayed in a custom ROM lineage OS 19.1 and I want to go back to stock I am doing the usual procedure but it does not enter download mode because I have TWRP and root but it does not allow me to enter download mode or emergency mode help please

 

[ardian1899]

Try to restore this LUNs backup. And then get into the download mode.

Sprint LG G8x LUNS backup A10

This is a new link for my Sprint LG G8x A10 firmware if anyone needs it?I had this posted before,but Google decided it didn't want me to share it!Hope it helps some! https://drive.google.com/file/d/1aCopHFSU2VWRH7eOoQjIsA11NMZFm7vt/view?usp=sharing

forum.xda-developers.com

I have to mention I never have your case so do it on your own risk.

 

[Panameno503]

Mi teléfono no entra de ninguna forma EDL o Download Mode tengo TWRP Y root como hago para bloquear el bootloader y no fallar en el intento