You're talking OS, not firmware. Loading a firmware intended for a different device model is a good way to get a brick.
By the way my firmware upgrade was successful. I'll be rewriting my "want it now" procedure next time because regedit + OTA is a lot easier than WDRT + setup everything again.
True, but I wouldn't have hesitated to flash the 1020, if I needed to, say with a EU firmware update, to put W10m on it ;-]
I'm not saying they should flash, just that they could, at-some-risk, obviously.
Or they could wait, maybe months, maybe a year or longer, for OTA, I can tell you things aren't pretty over there right now, in terms of updates OTA.
I customized my HP TM2 firmware awhile back (one whole bit), because I was annoyed that HP wasn't going to fix the issue with the switchable graphics, anytime soon (it turned out to be never). It wasn't all that hard, smart, eh, probably not, but the other option was to have a barely usable tablet/laptop, or go back to 8.1 (wasn't happening). BTW: I don't recommend anyone try to mess with their firmware, unless they're very comfortable in a binary editor, and reading at least HEX code.
That's pretty slick on the firmware->back to OTA , BTW. I'd do the regedit tweak next time too, now that you've "trialed it", and are saving it as "tribal knowledge" in the guide.