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Sigmastar unbrick

Locate the Sigmastar UART output and connect it to the CH341A I2C:

$\color{dimgray}{\texttt{GND -> GND (PIN 1-4)}}$
$\color{deepskyblue}{\texttt{TX -> SDA I2C (PIN 5)}}$
$\color{orange}{\texttt{RX -> SCL I2C (PIN 6)}}$

Download snander-mstar:

https://github.com/openipc/snander-mstar/releases

Check the device flash with snander:

Power cycling might help if the device can not be detected.

snander -i -q

Erase the boot partition:

snander -l 0x200000 -e

Write the new uboot file:

https://github.com/openipc/firmware/releases/tag/latest

snander -w u-boot-ssc338q-nand.bin

I2C devices:

0x49 -> MStar ISP
0x59 -> MStar Debug

Alternative Raspberry method by MarioFPV