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For homebrew exploits, there was also a new one discovered and implemented last year, called FreeDVDBoot. The newest model of the PS2 Slim fixed the memory card exploit, and this new exploit doesn't require a modchip or any other hardware modification.
https://github.com/CTurt/FreeDVDBoot
There is a work-in-progress port of the newer Linux 5.x kernel to the PS2: https://github.com/frno7/linux
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