Doing anything close to the kernel/bootloader on PinePhone almost always requires a serial cable, Pine64 store has premade serial cable available for 7$ USD, but making your own serial cable can be both cheaper and more flexible as a DIY cable can support multiple logic level and pinout configuration. Parts Overview # You will need: A 3.5mm audio cable, I got mine from a pair of broken headphone A multimeter for continuity test A USB-Serial adapter, you can get one online for around 3$ USD, make sure it supports 3.
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