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How to update new BIOS in Dell Inspiron 3521 without battery?

Hey Guys,

I bought my Dell Inspirion 15 3521 Windows 7 OS in 2013, past few months my battery was not charging. I checked with my battery and it was good. I got to know that my BIOS was an old version so I tried to update the new one but i could not able to do it cause of my battery is not charging. It says at least need 10% to do it. Also I tried some other boot options using DOS but nothing has worked. Could you please any one assist me for any other ways to update it without battery?

Thanks in Advance.

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