一台吃灰很久的FTM-400XDR拿出来升级固件,刚开始是WIN11提示芯片不支持数据线内部的PL2303,因为是HP订制的家庭版系统,所有改旧驱动的办法都无效,只好在商城白嫖一块板子飞线升级固件
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_8ce0e3994ec0122.jpg?144)
结果升级MAIN固件成功.在升级DSP固件时,按D键,一直显示"等待",没有转显示"DSP<->COM".
于是拆机研究,结果在DSP附件发现有一个三极管烂了
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_b92c1115c2c72d5.jpg?309)
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_97e25d548d9ddf8.jpg?725)
于是就艰难的求神找图纸.历经十几日之后,终于得到一份图纸分析,
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_6bc7a14712dd22a.jpg?112)
![](https://www.hellocq.net/forum/attachment/Mon_2405/13_94423_20ff4674bba26d3.jpg?54)
原来损坏的三极管是延时供电给DSP的管子,将就用一个三极管8050代换上去,开机测电压有8.2V.尝试升级DSP,按D键之后终于有显示"DSP<->COM
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_e3485b60bcccc28.jpg?62)
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_cc910a8ce3cda8c.jpg?194)
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_eef9470e959ef03.jpg?328)
最后升级成功,查看版本
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_2f476fd4a6b8f08.jpg?143)
![](https://www.hellocq.net/forum/attachment/thumb/Mon_2405/13_94423_f5d19b071f2a5c6.jpg?149)
这次升级过程一波三析,可能是全国首例故障,特此分享给大家少走弯路