If you see 0xFF repeated for an entire 64KB block, that sector was marked as "dirty" in the 6531e's FTL. The file is still valid, but that section contains no data.
: Always use a tool like the Spreadtrum Dumper to back up your current firmware before attempting to flash a new one. 6531e w25q32bv flash file
Using a firmware file from a different, even similar-looking, phone model will likely lead to "dead" phone, white screens, or inverted colors. If you see 0xFF repeated for an entire