The last syllable is usually pretty subtle, like the br- in bread, but very quietly voiced. I'd say I hear it maybe 75% of the time I hear the word. Currently in Yorkshire, via SW England, London and NW England. The syllable is a lot less subtle in a West Yorks accent!
Did you learn French at GCSE level? Possibly there's a relationship between that and pronouncing the re like that in French-derived words. Cadre is another example. If it is related to learning French, then it's probably on the decline as French teaching is on the decline and foreign languages are no longer compulsory at GCSE.
I doubt they'd have to retire the phone - digital radio power levels are normally pretty easy to change in the radio firmware. Which also means it's pretty easy to change, intentionally or unintentionally, in a later OS version.
Perhaps Apple chose to cheat to improve reception after mandatory testing was complete and the phone was available to buy, figuring they'd never get caught out. Perhaps Apple didn't retest with later OS versions and it was unintentional. We will probably never know.