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help era
erase start end
    - erase FLASH from addr 'start' to addr 'end'
erase start +len
    - erase FLASH from addr 'start' to the end of sect w/addr 'start'+'len'-1
erase N:SF[-SL]
    - erase sectors SF-SL in FLASH bank # N
erase bank N
    - erase FLASH bank # N
erase all
    - erase all FLASH banks

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