Code: 1. Rename the original bios file N43JFAS.210 to N43JF.bin. 2. Copy the file to usb flash stick. DO NOT MAKE anything etc. ONLY COPY 3. Remove battery, adapter (power cord) , mouse etc. (not use the battery to recovery) 4. Attach usb flash stick (try with the lower left slot at first) 5. Hold down <CTRL> + <Home> 6. Plug In the Ac Power adapter, wait about 3-5 secs 7. Press the power button 8. wait 3-5 sec and now release the buttons <CTRL> and <Home>. 9. The screen of the built-in BIOS flash utility appears and the BIOS is restored. It took about 2-3 minutes and notebook powered down itself....... Then plug in the battery simply power it on. That’s all. if still under warranty, take it to the center