For Aruba 620/650 use the following:
cpboot> nand erase 0x3200000 0x3200000 (620)
cpboot> nand erase 0x6400000 0x9c00000 (650)
You don't need to remember this command, use printenv you can see it.
Wipe-out-flash = nand erase 0x6400000 0x9c00000
And be careful.
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THIS COMMAND WILL WIPE OUT EVERYTHING.
YOU HAVE TO UPGRADE A NEW AOS FORM APBOOT.
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Jia Hao