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Here's something frustrating in hardware design: vendor designs custom board such that there's no recovery mechanism without doing hardware rework. In this case, instead of providing a dip switch or jumpers, they force the developer to desolder/solder an 0402 resistor switch from QSPI<->UART bootloader mode. Just no thought to designing for development at all.

@mdp

you've started to work with Rockchip devices I see...

@twoerner no, just a poorly designed board. Could have been any SoC in the hands of this person.

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