I have a perfectly working phone, that doesn't want to enter into download mode. From what I've seen in other threads, it seems to be related to the laf partition. Another user with a similar problem gave me this link:
I downloaded the version for my device (D802) but TWRP refuses to flash it:
"assert failed: run_program( " /system/bin/sh" , " /data/local/tmp//revert_aboot.sh" ) == 0
E : Error executing updater binary in zip ' /sdcard/fixlaf_d802.zip '
Error flashing zip ' /sdcard/fixlaf_d802.zip '
Updating partition details...
Any ideas? I want to go back to a 100% stock rom, I need Download mode for that.