This does not roll back to previous version of BIOS, but does rewrite the feature settings. Sometimes, reloading BIOS defaults can be useful after a BIOS version upgrade is performed, if there are abnormal symptoms noted. You can go back to BIOS and change settings that you previously customized, if needed. Select the option to reload BIOS defaults, then select the option to save and exit (ofter F9/F10) If the system now starts up and produces the Lenovo or ThinkPad screen, press F1 or appropriate key to enter system BIOS. Put in back the battery and reconnect AC.Press and hold power button several time for several seconds each time.
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