there are so many causes to this issue 1. EMMC READ-ONLY this is the most common one when the emmc become readonly mean it will flash to 100% but the data will remain the same or Retro i think no solution because need remove emmc chip then pinout on jtag box then remove write protection that is i the emmc is SAMSUNG, second one not common is when the flash file is backed up with userdata this way you might neeed to restore factory settings
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