I used Nand Erase All

Hello, I wanted clean flash stock rom on my Galaxy S5 G901F so I did that using Nand Erase All and I did it 2 - 3 times to try different Regions. After the flash was done I was getting "device memory error: the data partition has been corrupted. You need to reset your device to factory defaults. This will erase all your data." After I pressed the button everything was erased and it was working fine. Did I do any harm to my device ?

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