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Dell Inspiron 15 3542 bios firmware update problem windows 10

Hi all,

I have a problem with the wifi of Dell inspiron 15 3542. I updated it from win 7 to win 10 and the wifi keeps connecting and disconnecting until it can't find any wifi network.

I decided to update the firmware of the bios. 

The bios firmware was in ver A01 and the latest is A10. I couldn't update fro 01 to 10 and it kept saying unsupported system.

So i tried to take it step by step. I wanted to update from 01 to 02 to 03.....10, but i did a mistake and i updated from 01 to driver 3443A02 and not 3442A02. Now i want to restore previous versions of bios firmware but i can't find a way. 

What should i do?

thank you

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