I'm not new to rooting, bootloaders, and ROMs, but I am new to the G3. My current phone is a Nexus 4 on Cricket (AT&T), so of course everything ROM related couldn't be easier. I figure the G3 will be "harder" by virtue of it not being a Nexus device. My D850 will be here in a couple of days and I want to hit the ground running with a root and bootloader unlock. After poking around, I thought it would be easier to ask the community where to start and what steps to take.

1.) Root: I see that Stump is no longer supported; will it still work or is it because LG has patched the exploit? If the latter, is there an alternative root method you recommend?
2.) Unlocking the bootloader: I see Bump! Is this a "true" unlock (ie. I can install any AT&T ROM variant) or do I have to use specific Bump ROMs after installing TWRP? Is there any other (better) options?
3.) ROMs: I assume you can only use AT&T ROMs on an AT&T G3 variant (mine's the D850) due to the specific radios. Any known issues with using the D850 on Cricket?
4.) Any thing else I should know about ROMming for the G3? In terms of flexibility, I've been spoiled with the N4, but I'm looking forward to the hardware awesomeness that is the G3!

TIA for any and all responses! I love the XDA community :)

I have a new Tab S 10.5 running stock firmware. It's not on a carrier and is just the wifi model, SM-T800 running the latest version available, 5.0.2.

Many moons ago, I had an early android device where I could get root privileges that didn't alter the OS or setup, but instead simply granted the user the ability to elevate their privileges to superuser status. Is this still a possibility or must a new image from a ROM be used?

Also, I was told that the non-carrier devices do not have a locked bootloader. True?

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I Have P7-L09 Its Only Work With Chinese Telecom SIM Card. Please If You Have Any Idea About How I Can Unlock I Will Really Appreciate It.