# OpenIPC Wiki [Table of Content](../README.md) Sigmastar unbrick --- **Locate the Sigmastar UART output and connect it to the CH341A I2C:** - $\color{dimgray}{\texttt{GND -> GND (PIN 1-4)}}$ - $\color{deepskyblue}{\texttt{TX -> SDA I2C (PIN 5)}}$ - $\color{orange}{\texttt{RX -> SCL I2C (PIN 6)}}$ <img src="../images/sigmastar-ch341a.webp"> <img src="../images/sigmastar-uart.webp"> <img src="../images/sigmastar-example.webp"> --- **Download snander-mstar:** - https://github.com/openipc/snander-mstar/releases <details> <summary>Install Windows driver</summary> <img src="../images/sigmastar-driver.webp"> </details> --- **Check the device flash with snander:** - The device must be powered when connected to the programmer. - Power cycling might help if the device can not be detected. ``` snander -i -q ``` <img src="../images/sigmastar-check.webp"> **Erase the boot partition:** ``` snander -l 0x200000 -e ``` <img src="../images/sigmastar-erase.webp"> **Write the new uboot file:** - https://github.com/openipc/firmware/releases/tag/latest - drop the file into the same folder as the program ``` snander -w u-boot-ssc338q-nand.bin ``` <img src="../images/sigmastar-write.webp"> --- **I2C devices:** - 0x49 -> MStar ISP - 0x59 -> MStar Debug --- - [Alternative Raspberry method by MarioFPV](https://youtu.be/88C8UvyKQlQ)