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You probably need to replace the BIOS battery. This battery is small and on the inside of the laptop connected to the motherboard. It stores the BIOS settings, date and time. If this battery becomes worn out then it will cause your issue.
First try and press F1. Navigate to the last tab and select to restore defaults, then save and exit. If the computer boots up fine but the next time you use it the same message appears then you need a new BIOS battery.
Alternatively your HDD may be damaged if it cannot find a boot device. Check your HDD is recognised on the boot menu by pressing F12, select it and press enter and your OS should boot.
Hope this helps,
If you are talking about the Boot, HDD, Bios password, then the only one way to recover it is to implement a chip on the systemboard to shorcut the protection or to contact Lenovo for a systemboard replacement.
Unfortunalty, no other ways other round.
Thanks and have a nice day
So, what is it you want to do?
The hard drive on a T20 is in a slot on the left side of the unit, and it's cover can be taken off by removing 1 screw on the bottom just under the sound ports.
Hope that helps.