I've read a lot of unbricking tutorials of LG G3, Xiaomi MI5 etc... and the only way to get my G4 restored is to use QFIL and the appropriate files to G4.
https://www.droidsavvy.com/unbrick-qualcomm-mobiles/
I couldn't find the prog_emmc_firehose_8992.mbn file for LG G4
Could you please show me how to generate it from another G4 or where to find this file ?