[LG V20 Guides, News, & Discussion] xdav20:
Found the culprit(s)

[MENTION=1657835]jahlex[/MENTION] [MENTION=6984210]emdroidle[/MENTION]

Newly flashed f10c with Formatted Data and factory reset

1. Stock 10c lists 4 drivers, camera focus issue, exFAT supported, no scan fix issue plugging USB Drive to a Notebook

2. Rooted 10c with dirtysanta v0.2.0 (Original), lists 4 drivers (suprised, no missing driver), exFAT supported, no scan fix issue plugging USB Drive to a Notebook

3. Flashed [MENTION=6984210]emdroidle[/MENTION] v0.2.2, lists 4 drivers, camera focus issue, exFAT supported, no scan fix issue plugging USB Drive to a Notebook

4. Skipped all [MENTION=6984210]emdroidle[/MENTION] v0.2.2 experiments

5. Flashed jahlex>emdroidle v0.2d, lists 4 drivers, camera focus works, insertion of an USB Drive OTG did not prompt anything (no response from the system), unplugged and plugged back again and observed same behaviour, no scan fix issue plugging USB Drive to a Notebook, rebooted, repeated the same process with USB OTG and yelled the same result

6. Flashed jalex>werewolf v0.1, lists 4 drivers, camera focus works, exFAT supported, first USB Drive caused no issue, Unplugged>Plugged USB Drive and observed no issue, no scan fix issue plugging USB Drive to a Notebook, rebooted, repeated the steps with USB Drive insertion and observed no issue

7. Flashed Leicxan>werewolf v0.771, lists 4 drivers, camera focus issue, exFAT is supported, passed all above USB OTG tests

8. Since only [MENTION=1657835]jahlex[/MENTION]'s dirtysanta variant caused issue with exFAT and USB and the subsequent kernel flashing process fixed the issue, unlike in the past, I reflashed [MENTION=6984210]emdroidle[/MENTION]'s older v0.2.1.experitment2. If I have a kernel in my folder most definitely I flashed it once before. 4 camera drivers are listed, camera focus issue, exFAT supported, passed all USB tests

9. Since I have not observed the severity of the problem in my previous ROM now I have to upgrade via kdzwriter with -aM options to replicate my old setup and then repeat flashing kernels in v10f. However, I am almost certain that, at least, one old kernel is missing in my test and that might have been jahlex>emdroidle v0.2b

10. Before kdzwriter process, flashed [MENTION=6984210]emdroidle[/MENTION]'s v0.2.2 kernel since is stable and did a reboot before rebooted back to recovery

11. Upgraded TWRP to elsa-3.1.1 since kdzwriter doesn't play well with the older version. Then again elsa-3.1.1 doesn't play well with flashing kernels

12. kdzwriter -aM process done. rebooted system. 4 drivers are listed, camera focus issue, exFAT NOT SUPPORTED (found the culprit) and got the massage to reformat the attached USB Drive. Since my SD Card is Fat32 now it reads without any issues but when was exFAT couldn't read it either. Going to try kdzwriter with -a option now.

13. kdzwriter -a failed to write the kernel part and recommended to flash kernel. installed dirtysanta's TWRP (3.0.2-1), rebooted recovery, flashed emdroidle's v0.2.2 kernel, wiped cache/art cache, reboot. 4 drivers are listed, camera focus issue, exFAT supported, USB passed all the usual tests. At this point, I believe nothing can go wrong since the kdzwriter -aM options plagued my ROM with exFAT and USB issues but the cure was with kdzwriter -a option. Next flashing jahlex>werewolf kernel v0.1

14. Flashed [MENTION=1657835]jahlex[/MENTION]>@werewolf kernel v0.1. 4 drivers are listed, camera focus working (thank you [MENTION=1657835]jahlex[/MENTION]), exFAT supported, all usual USB tests passed. Good results and my sincere thanks to all involved, much obliged.

I'm not done yet, since I know running kdzwriter -a option plus reflashing a kernel will fix exFAT and USB issues that means I can restore my twrp backup (infected one) that I spent weeks to setup and just repeat step 13 with jalex's kernel in step 14 to save myself huge amount of work. If you found it in my position step 15 will be your saviour.

15. I have completed this process with an unexpected result. My restored ROM had a pin lock setup and after all the work the pin lock never worked again, meaning I have to start from the scratch again. If you want to avoid any unforeseen issues and your ROM was flashed by kdzwriter -aM I highly recommend to go back to 10c and start all over again.

Since I proved [MENTION=1657835]jahlex[/MENTION]'s dirtysanta variant doesn't support exFAT and USB issues I would like to request the removal of the download link to avoid any future issues to the users, maybe an announcement of the issue would be a good gesture. [MENTION=1657835]jahlex[/MENTION] I will be using your werewolf variant once I reinstall everything again.

I would like to request [MENTION=6984210]emdroidle[/MENTION] to look into the -aM option and see what goes wrong with exFAT and the subsequent USB issues please.

[MENTION=1657835]jahlex[/MENTION] At no point of testing and observations I noticed a missing camera driver. I was wrong to think I may had seen it once with only three drivers in 10c ROM being listed but that would have proved you right about the missing driver which the topic was started by you alone. Whatever you have done fixed the problem, maybe it was a newer version of the driver that did the job, or maybe something else. I would love to know, my nature that is. I may have come too strong, inadvertently, but my intentions are always good. You have my respect for being the one fixing an important issue with our H990DS's camera.

One more problem solved.

---------- Post added at 19:41 ---------- Previous post was at 19:27 ----------

If you are struggling with [MENTION=6984210]emdroidle[/MENTION]'s instructions then you would find it easier in page link. Look for post #564. Good Luck.