I have a nice Samsung Tab Pro 8.4 (SM-T325), rooted w Towel Root, KNOX untripped. This device was stranded by Samsung at Android 4.4.1, though its hardware is faster than many more recent tablets. I've already successfully changed from the original ROM to the latest but still very dated UK ROM, and successfully re-rooted. I'd like to update the ROM (preferably to 8.0 or later), but have found little on this site or elsewhere about good options. As this tablet is also a PHONE, it's somewhat of a rare bird, and I'd really like to preserve all of its hardware functionality in an upgrade of the OS. Any suggestions, please? I've found no new tablets with equivalent features (closest being the Samsung Tab S4, which has great data features, but no phone). Thanks.