[Q] T705W wont boot any 5.1 ROMs - Galaxy Tab S Q&A, Help & Troubleshooting

Hi folks,
Its been a long while since I've played around with Samsung devices (Galaxy S1, lol) and I'm running into some issues after picking up a used Galaxy Tab S 8.4 LTE (T705W Telus [unlocked]). So far I've got it updated to 5.0.2, rooted, and installed TWRP 3.0.2-0. I've got a nandroid of the stock rom that I've been using to fall back to as well as a copy of the Telus firmware if things go south. With my limited knowledge and reading/searching before creating this thread, I know that I'd likely need an updated firmware in order to get Marshmallow, but that doesn't appear to be available for the T705W.
The Issue: It appears I'm unable to flash any rom that isn't for 5.0.2. I would have thought that running 5.1 based ROMs would be fine, considering they're both LP. However I'm not having any luck... I've tried CM12, BlissPop v4, PAC 5.1 LP, and Ressurection Remix LP. All of which result in an infinite boot of the ROMs logo (I've waited ~30 mins for each one)
The Questions:
What obvious thing am I missing in order to allow me to flash 5.1 based roms?
Is there any firmware for the T705W that I can use to run 6+ based ROMs? (pipedream)
Am I stuck on 5.0.2?
Thanks for your time!

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ciaran071198 said:
Hi guys, I have an SM-T525 LTE and I cannot get the stock ROM to boot. I am sure this is because I installed a marshmallow MODEM, Kernel or some other thing. I can get CM12 Lollipop to boot but Kitkat will not boot at all. Can someone please link either a Lollipop modem or give me some help getting this back up and running? I've never had this trouble and have also had a Galaxy Tab A and a Note 3 which I've installed plenty of different ROMs and Kernels on with no issues.
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Click to expand...
Click to collapse
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