Dell laptop could not display clearly after a BIOS update

i updated my Dell Inspiron n5040 laptop BIOS from version A02 to Version A05, and after a restart, its display was dark. I tried to adjust the brighteness of the screen, but it could not work. I tried to restart it, entered into BIOS setup, tried to set it to factory settings and saved changes, restarted, it went back to normal. But then, when i restarted the laptop afterwards, it went back to the dark screen. So how can i be able to flash back the BIOS to its original version?
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