TIP: Erase eMMC to Boot to SD
#1
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When i want to just boot on your SD to install new os on eMMC with serial at boot:
  • Hit any key to stop autoboot
  • write 
    Code:
    mmc erase 0 1000
  •  
  • then
    Code:
    boot


it will erase the first 1000 block on your eMMC so the rock64 will not be able to boot on it and will boot on SD
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