Did you bench check to make sure the bitmap image buffer actually made it into the FLASH image properly and that 00 value did not accidently get neglected to be programmed. Maybe there is some strange thing wrong with the utility you made or used to convert from the BMP file image to the FLASH image.

Did you convert the BMP to ASM DB statements and then include it into your program through the assembler? Check those steps to make sure the 00 to FF translation did not happen there.

Did you take a binary of the bitmap and try to merge it into the FLASH memory directly with some type of programming tool? If so make sure that this tool is not mistakenly thinking that the erased FLASH is 00 as opposed to FF. Some tools try to skip programming of bytes from the image file when they think that the erased flash is already at that state.

Michael Karas