[Samsung Galaxy S7 Edge Questions and Answers] kick60:
Hi folks, I would really appreciate some help (sorry for the long-winded post.)

I have an S7 Edge SM-G935W8 that I received as a "hand me down". It was reset to factory and updated to the latest firmware last week.

The phone was locked to Tellus and, as a SIM card is required to enable the mobile hotspot, I had Samsung unlock the phone so that it would recognize my old Bell SIM card in order to enable the mobile hotspot. The SIM card is not provisioned as I don't intend on using this phone as my daily driver and I don't require internet or data. I simply want to use it as a backup camera for my travel trailer by setting it up as a mobile hotspot using the camera to stream to my tablet using IP Webcam Pro.

This setup works relatively well but I only have the 2.4Ghz band available to me on this phone, which leads to a slightly choppy stream. It's not bad, but not great. I would prefer to use the 5Ghz band since it has less interference and thus runs faster, which I believe would yield better video quality. That being said however, the 5Ghz option is not available under the mobile hotspot advanced settings on this phone.

I then decided to root the phone, which I did without issue by enabling USB Debugging and OEM Unlock in developer option. I then successfully installed TWRP and tried both Lineage 17.1 and 18.1 since the 5Ghz does show up under the mobile hotspot advanced settings. Great I thought as the video feed was indeed better! That was until I discovered that there are issues with the video camera with these versions of Lineage whereby it works fine for about 15 or 20 minutes then the screen goes green and you need to reboot the phone in order to get the camera working again. I tried installing Footej to see if that would make a difference but it did not.

Soooo, I returned the phone to stock with ODIN and we're back to where I was before. It's a setup that works but could be better. I read that the 5Ghz band could be enabled with CSC Features Expert but you need root. OK, so I go back into developer options to enable USB debug and OEM Unlock like I did a few days ago and lo and behold, it no longer stays enabled. The option is there, NOT greyed out or anything. I toggle enable, get the message about device protection... and an option to cancel or enable. I click enable and it goes on then quickly goes off again so it now seems I can't root the phone anymore :(

I've scoured this site high and low, googled everythhing I could think of but I seem to be running around in circles. I can re-install the latest stock version of the firmware from any provider in Canada (I've tried a bunch) but the same always happens. The OEM unlock options gets enabled for a fraction of a second then turns off again. Can this option be forced on using ADB or Fastboot or some other method?

My goal is to root it again in order to install CSC Features Expert so I can enable the 5Ghz band in the mobile hotspot advanced settings. It also appears I can't downgrade to anything because Samsung updated the bootloader in the latest firmware. ODIN fails at installing any stock firmware except for the most recent.

Any help would be greatly appreciated.