aa1
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That work was not available when GrapheneOS was developed
What do you mean ? This has nothing to do with GrapheneOS in the first place (which by the way has been created in 2014. The article i linked refers to 2021).
I still consider it a black box.
Reverse engineering is a thing. It always has been. If every piece of closed source was a blackbox how can you explain exploitation ? How can bad actors exploit Windows, MacOS, CPU firmware and so on ? Your argument here is not practical. Also, why should Google put a backdoor inside a chip ? They already get every information they what directly from the people agreeing to use their software. So, why bother ? Moreover, every phone on the market has closed source firmware.
