Odin keeps failing when i try to flash twrp recovery on my phone.

Is it because i have king root instead of super su and would and also can you use flashify to flash it ? Im using sm-920L by the way.

Every custom ROM results with failing camera.

I have a Samsung Galaxy S5 SM-G900I, running stock touchwiz 5.0 Lollipop. Every time I try installing a new ROM, the camera app keeps failing and every other app that uses the camera shows a black screen. My device is rooted and has TWRP recovery version 3.0.2-2. The ROMS I have tried are CM13 nightlies (whichever one was the latest), Resurrection Remix (Marshmallow) and CM12.1 (Snapshot). Any help would be appreciated.

GPS failing with Pokémon Go.

My Girlfriend has the OPX and cannot play Pokémon Go cause the GPS simply doesn't want to work. It works with Google Maps no problem but in PG it says "Failed to detect location" or "GPS signal not found". Even with High Accuracy enabled it has this problem.

Is anyone else having this problem or knows a solution?

Thanks!

Phone stuck in boot screen after failing to update.

Hi, I have a Homtom HT3. Today I got OTA update, but it failed to install. After downloading it, the phone switched off to install it, but before completing the installation it showed an error. Now it's stuck on the boot screen.
I tried to flash a new ROM, but it seems impossible without a custom recovery like TWRP ("installation aborted" when trying to install from sd card in original recovery mode). So here is my question. Is there any way to flash a custom ROM directly from sd card using original built-in recovery mode? Or maybe there's a way to install some custom recovery on a phone, that doesn't even launch?
Thank you in advance, cheers.