[Q] Wifi Hotspot option missing from settings - Sprint LG G3

I previously rooted my friend's G3 on Sprint (LS990, ZV4, KitKat 4.4.2) with Stump Root, and used this thread
http://forum.xda-developers.com/lg-g3/general/guide-g3-hotspot-apn-edit-t2889436 to make the hotspot work. He updated to ZV6 thinking it would fix some LTE issue that was happening. The LTE problem was related to coverage and eventually went away on its own, but now he lost root. I found out how to wipe and downgrade back to ZV4, did that, rooted with stump root again successfully, and tried to redo the hotspot fix. I assumed it would work as simply as last time, but when my friend went to turn it on, he said the WiFi Hotspot option is missing.
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I have tried everything from play store replacements to widgets to build.prop edits but nothing seems to work; the best I have gotten is creating a network with the chainfire tether app but being unable to get any internet through it. I'm assuming the missing option is an indicator that the hotspot is completely disabled somewhere else. Any ideas?

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This same thing happened to me after downgrading you have to do the ##RTN# fix. Just revert to 100% ZV4 (unrooted) like before. Then call sprint and ask for his msl code. Once you got it go into the dialer and type in the ##RTN# click "reset" and type in the code from Sprint. This will wipe everything and reset it with everything that originally came with the phone. After the reset then root it and do what you wish.

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You could try flashing the apns from here. http://forum.xda-developers.com/showthread.php?p=56953010

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You might also try updating profile and PRL. If that doesn't work, try entering ##72786# in the dialer. I had a similar issue, and that fixed it for me.

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Did you ever figure out how to fix this?

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I figured it out! change ro.build.target_country=US to ro.build.target_country=COM

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Instead of resetting you could also manually enable it if you have root and app 'Shortcut Master(Lite)'
In the app, do a search for 'ChameleonNodeMenu' and launch it.
Click 'Tethered Data' and SET value to 3.
Reboot
If you're on a MVNO, it is necessary to enable manually (if disable) as it will not auto enable with ##RTN#.
You can also enable Roam setting menu by setting Roam Pref/Menu Display value to 1

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Missing hotspot capability after using LGFlashtool
I lost my hotspot tethering when I used LG Flash tool to fix a phone that was stuck in a continuous start-up cycle. I have an LG Volt with Android version 4.4.2, Kernal 3.4.0+ Build number KOT491.LS740ZV6 and Software version LS740V6. When I use root checker, it states Root access is not properly installed on this phone. I do not think I tried to root it.
I have tried apps to get my computer to use my phone as a hotspot since that ability is now missing on my phone, but I cannot get them to work. Can you please explain how to do this? I see ways listed above (tethered data or ro.build.target), but I do not know where to start to even get those to work.
Thank you!