We recently tried upgrading a controller product by replacing an ST10F269 chip with an ST10F272. The Keil development environment seems to work. However, we have a problem when using the HiTex programmer to program the flash memory. The HiTex program appears to perform the programming function, and says that it was successful, but when we try to run the chip from the flash memory, the program does not appear to run. Does anyone know of any subtle differences between the 269 and 272 chips that might cause something like this. Many thanks for any help.