Pico Pi is such an amazing little tool. @riku maintains, in libreboot, a fork of pico-serprog. You can build it in lbmk for pretty much all RP2040-based dongles including Pico Pi, and then it becomes a cheap (but good) SPI flasher, far superior to the CH341a for these reasons:
Much better incoming power circuit (for 5v to 3.3v)
3.3v logic levels by default - some CH341a are 5v which can damage 3.3v ICs
Generally higher build quality and more versatile, can be reprogrammed for many uses
