It would be a good thing if I had seen it before cutting my ECU to open!
Look at all files, looks like there is a program to flash
ST10F269
This program is made for laboratory environments and usage by engineers knowing the device they are working with. This is a free tool which must be taken as it is, no support being ensured.
The target of this flasher is simple: A engineer develops code for one of STMicroelectronics nice embedded flash microcontrollers (like the ST10F168 and others) and wants to program it (fast and easy) from his desktop PC into the chip. If that is what you are looking for, then this program is for you.
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ST10Flasher supports following ST10 derivatives:
ST10F168, ST10F169, ST10F269