Hello, the file is the content of the NXP LPC1768 memory extracted with Keil program (only .hex possible) The first file (SAAB4.hex) is only from 0 to 0xFFFF and is OK The second (SAAB9.hex)is from 0 to 0x10FFF and is wrong with usbprog,but OK when i compare both with winhex. thank you Gerard