The culprit? Often, it is a failing NAND flash controller from (also known as ChipsBank or Xintec). Specifically, the FC1178 and FC1179 controllers are notorious for firmware corruption due to improper ejection, voltage fluctuations, or reaching the end of their read/write cycle life.
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You either own a (e.g., a 8GB chip programmed to report 64GB) or the tool disabled bad blocks. Run MPtool again, but this time go to Setting → Capacity → Set as Manual and type H=16384 (for 16GB). If it fails, the drive is genuinely only 8GB. The culprit