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Aerospace Engineering often requires triple modular redundancy (TMR). While VxWorks bootable image is ROM address relevant and it cannot be used as a TMR type image directly. The new compressed image based on VxWorks compressing algorithm is independent of ROM address. The image can be copied exactly to store in three ROM areas. When system booting , each bit data copied to RAM to make up a complete image is got by comparing three bits in the same position in three same image stored in ROM area. After software boot, the one bit type error which is usually caused by Single Event Upset (SEU) can be corrected by writing back the correct data in image. The software boot reliability benefits from the new type image and TMR booting mechanism greatly.