Personal knowledge.
I can't name the phone because it never became public that this is what the fix did. They were in fact, required not to say this is what happened. You'd have to find someone willing to break the NDA (and I know a bunch of these people hang out on hacker news, so maybe you'll get it!)
However, the fact that this kind of thing is required is public knowledge through source code, so i'll repeat the link someone else posted:
However, the fact that this kind of thing is required is public knowledge through source code, so i'll repeat the link someone else posted:
https://android.googlesource.com/platform/frameworks/base/+/...
(my particular story was not about LTE, however)