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If the screen was working fine then an update caused it to stop working that doesn’t sound like an issue with the display but rather a hostile software update that is preventing it from working merely because it is a knock off screen but was working as you say just prior. Should be mad at apple in that case not the knock off screen.

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Probably, but not necessarily. Could also be a code change that works perfectly fine for the OEM part, but not the third-party one.

Manufacturers can't realistically be expected to guarantee a device will keep working as normal with third-party parts.

Sure, but having the screen stop working because of an unforeseen coincidence is very different from intentionally breaking the screen with malicious intention. Besides, has there been a single documented case in the history of smartphones where a device manufacturer changed the communication protocol with a display via OTA update after the phone shipped?

I can think of a myriad of things such as enabling a feature that was previously disabled/in development, updates to calibration values/curves, tweaking timing and power saving control registers, etc.

Any of these could throw off a third party part if not implemented exactly the same way.

Sure, but we also know for a fact that Apple does a lot of tweaking to disable non-genuine parts. Seems as likely.

Surely Apple maliciously went after some tiny third party that sells 3 screens per year.

Occam’s razor..

Apple, that rules their supply chain with an Iron fist and prosecute owners of independant repair shops?

Why would they ever have a plan to make sure only their screen works with their phone?

Apple has had internal memos leaked in the past where incompatibilities were specifically engineered in macOS with plausible deniability, so I wouldn't be so quick to give a benefit of doubt.

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