Im really hoping someone has encountered this and can help as its driving me mad. I am running Keil toolset v4.11 and programming a STM32F device with a ULINK2 and using the serial debug facilt and not JTAG. The ULINK2 has v1.4 code runnig on it (NOTE that a ULINK2 with v1.41 wont even programme the device). The code im using consists of a boot loader and application. The code compiles and programmes okay. If I try and debug the code with the ULINK2 the code flashes up the debugger for a breif moment and closes again. Does anyone have any ideas as to twhy this happens and why it will programme but not debug?