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This sounds like step3/TWRP installation is being very unreliable. I'm wondering whether it is best to advise people to run the command manually (increases complexity). The one other issue is step3_h990ds.bat must be in the same directory as twrp-3.0.2-1-h990.img







According to reports, "LG Backup" is pretty reliable at backing up and restoring data. The one caution is, if you backup to SD card, your SD card cannot be encrypted since Android's encryption will break any attempt to restore. I must strongly advise getting a backup onto a laptop/desktop computer.



LGUP's "upgrade" option is the non-factory reset, "refurbish" includes a factory reset. I've read downgrading may require use of "refurbish" though.



Using LGUP to upgrade to a newer firmware version will lose root. The problem is flashing a KDZ file replaces aboot and boot. What is needed is to only flash /system and /firmware while leaving everything else alone. I hope to create a utility for this, but that will take a while (you need to understand the KDZ format, something LGE isn't going to publicly document).







Heh! Yeah, I can see that happening. Yet another odd little issue to document.









How many variants of the H990 are there? I'm aware of the H990DS dual-SIM and the owners of the H990N single-SIM have been quite noisy; there is also a H990N dual-SIM? Problem is the adjusted kernel is setup to correct the bad information from the unlocked DirtySanta bootloader. In order to do that, it has some of the parameters hard-coded. If there are 3 variants out there, not just 2, then I have to look towards alternative strategies otherwise I end up having to build a bunch of different kernels. This is doable, but is yet another increase in complexity.