I have two Lumia 950XLs, one for my wife and one for me. This is on T-mobil. Mine is pretty stable, almost no issues. My wife's, however, had many...heat, constant dropped wifi, some glitches on her apps. I already did a hard reset in hers, and re-installed apps, and have done a lot of troubleshooting. It has improved, but not to her liking. I was wondering if the more stable Windows 8.1 can be installed on these phones. Let's not make this a Windows 10 vs 8.1 debate. Each one has advantages and disadvantages over the other one. Can Windows 8.1 be installed on the 950XL, at least for now, until a more stable 10 version is released?