The programmer do the self test; Original USB line; Make sure of the enough power supply of 5V (red line) for the desktop computer; With nice 24XX,25XX,93XX chips(a new one is not always the nice one); Use the simple board to replace the bounce seat,clean the welding paste after welding. Cancel the √ of![](https://box.kancloud.cn/58a60c41070a319e1fff49272f823405_159x23.png)in the programming setup options,click![](https://box.kancloud.cn/a1a07ce6f907f128784cc808cebef19a_75x26.png); ![](https://box.kancloud.cn/f8a43924f1e73839051db6b1cc387f2c_435x364.png) The problem easy to appear when reading NAND chip : byte verify inconformity. ![](https://box.kancloud.cn/185f2c0f056119506c2bb19b53dfdc06_487x145.png)