I have flashed custom rom, then got back with the guide to oos 15, but didnt have signal, decided to relock bootloader from recovery and now im stuck with 1 second flashiung image of oneplus logo and repeating, its hard bricked, i need to fix my device using DL mode only, its the only thing i can access anyway, any guide i can go through to follow this>?Please let me know what can i do...