Hey. I've downgraded from Nougat to Marshmallow using this guide: http://forum.xda-developers.com/lg-g5/how-to/downgrade-7-0-to-6-0-1-lg-g5-h850-t3511930. I've tried to install TWRP but the button combination doesn't work. I've followed the instructions to the letter, I've pulled out the battery, kept volume down pressed all the time etc., etc. I've tried different timings. Before the downgrade I was able to get into TWRP easily. My volume down button works, I've checked that. I'm able to get into the display IMEI mode (both VOL UP and VOL DOWN pressed down) and into the download mode. I can get into stock recovery with adb. I've upgraded back to Nougat, then reflashed boot and stock (Nougat version ofc) and then tried everything again but to no avail. I would appreciate any help.
Additional note: I've tried 3.0.2-0 and 3.0.2-1 on Marshmallow and 3.0.2-1 on Nougat.
EDIT: I have 2 ideas. First, manually reflash all the paritions from the unpacked KDZ. Second, use the Dirty Cow. First one will take time, but should be safe. Second one will probably take even longer, since I'm not really good with Linux and this method wasn't designed for H850, though it should work, unless LG patched it in Nougat.
EDIT 2: Most partitions are unflashable (FAILED (remote: cannot flash this partition in unlocked state)).
!WARNING! Useless discussion below, no need to read the current replies.
Additional note: I've tried 3.0.2-0 and 3.0.2-1 on Marshmallow and 3.0.2-1 on Nougat.
EDIT: I have 2 ideas. First, manually reflash all the paritions from the unpacked KDZ. Second, use the Dirty Cow. First one will take time, but should be safe. Second one will probably take even longer, since I'm not really good with Linux and this method wasn't designed for H850, though it should work, unless LG patched it in Nougat.
EDIT 2: Most partitions are unflashable (FAILED (remote: cannot flash this partition in unlocked state)).
!WARNING! Useless discussion below, no need to read the current replies.
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