Tab S2 SM-T715Y Nougat build.prop changes for Gear Manager - Galaxy Tab S2 General

Hi Folks,
I have a rooted Tab S2 SM-T715Y and recently updated to Nougat. I am looking to get advice on build.prop changes that will allow me to install Gear Manager to allow my Gear S3 to connect to my Tablet.
Previously when running Marshmallow I had changed the build.prop ro.build.characteristics from "tablet" to "phone" and the ro.product.model from "SM-T715Y" to "SMN900P" however when I make these changes now and reboot the device just stays on the Samsung splash screen and will not boot. I have to re-flash Nougat update to get it to work.
The original ro.build.characteristics on Nougat is listed as "tablet,emulator" which seems odd.
Any help with this would be appreciated.
thanks

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Samsung Glaxy TAB A 8.0 SM-T355Y (LTE version)
I need to get this Tab off Nougat (7.1.1) as it's dead slow and almost un-usable, even with rooting and debloating. My wife has stopped using it and I don't want it to become another piece of e-waste. I appear to be out of options and wondered if anyone had any suggestions.
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a) Root/TWRP/debloat of stock ROM. This seems to work initially but any usage in a browser is painfully slow.
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https://forum.xda-developers.com/galaxy-tab-a/development/rom-t3903258
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Kernel is not SEANDROID ENFORCING
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https://forum.xda-developers.com/galaxy-tab-a/development/rom-galaxy-tab-series-t3514996
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Any updates?
Bump!
Desperately looking for a way to make this device workable!
Any option including building own ROM, installing pure Linux, etc.is acceptable at this point. All I need is for WiFi to work.
PLEASE HELP!
Postmarketos : https://wiki.postmarketos.org/wiki/Samsung_Galaxy_Tab_A_8.0_LTE_(2015)_(samsung-gt58lte)
PR : https://github.com/msm8916-mainline/linux/pull/195

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