Can't flash eMMC on Compute 4 mod

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Try it “without” the jumper on J2. I believe you only set that jumper if your CM4 doesn’t have eMMC, or you haven’t flashed it yet / not using it.
Flashing the Compute Module eMMC - Raspberry Pi Documentation

  • Make sure that nRPI_BOOT which is J2 ( disable eMMC Boot ) on the IO board is set to the ‘EN’ position.