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Tools like fastboot or SP Flash Tool rely on a scatter file/partition table. If the partition boundaries are defined incorrectly in the flashing tool, the keymaster partition might be written to the wrong memory address, leading the bootloader to read "garbage" data instead of valid keys.
The most frequent culprit is using an older version of Lockpick_RCM or Atmosphère that does not support the current firmware version installed on your device.
Instead, a single, brutal error flashed in the center of his vision:
POPPIANO.ORG
Sheet Music