Lenovo T450s bios/supervisor password (help needed, will donate)

[barbus]

Hello,

A complete beginner here so I am sorry if I say or ask something stupid.
Recently I wanted to upgrade to Windows 10 on my Lenovo ThinkPad T450s 20BW. When I tried to access the BIOS settings I realized I need a supervisor password to access BIOS. I don't have the papers that came with the laptop and I don't remember the password. If I just press Enter I can access the BIOS settings but many options there I can't modify. I read somewhere I can try to unplug the CMOS battery and regular battery. After trying that I am in even more trouble because now I have Error 0271 - Check Date and Time Settings on the screen when I turn on the laptop. I spoke to Lenovo support since my laptop is still under warranty but they want to replace the motherboard which is insanely expensive. I was told my laptop is a newer generation of Lenovo laptops that store the supervisor password differently comparing to older models and resetting the EEPROM chip using jumper method will not work. I was also told the supervisor password can be recovered or reset with the help from the people here if I have the dump from the BIOS chip. 
Anybody here can help? Willing to donate if my laptop is fixed.
Thanks in advance.

[Nameth]

Hello,

A complete beginner here so I am sorry if I say or ask something stupid.
Recently I wanted to upgrade to Windows 10 on my Lenovo ThinkPad T450s 20BW. When I tried to access the BIOS settings I realized I need a supervisor password to access BIOS. I don't have the papers that came with the laptop and I don't remember the password. If I just press Enter I can access the BIOS settings but many options there I can't modify. I read somewhere I can try to unplug the CMOS battery and regular battery. After trying that I am in even more trouble because now I have Error 0271 - Check Date and Time Settings on the screen when I turn on the laptop. I spoke to Lenovo support since my laptop is still under warranty but they want to replace the motherboard which is insanely expensive. I was told my laptop is a newer generation of Lenovo laptops that store the supervisor password differently comparing to older models and resetting the EEPROM chip using jumper method will not work. I was also told the supervisor password can be recovered or reset with the help from the people here if I have the dump from the BIOS chip. 
Anybody here can help? Willing to donate if my laptop is fixed.
Thanks in advance.

Hey, did you get this resolved?

[Philo62]

Hello !

I'm sorry in advance for my bad language.. but i'm just a french boy xD.

So, i think that my curiosity has been cost me expensive..

I wanted dump my bios on my Lenovo T450 like " barbus " the dump is ok with my usb programmer CH341A,
the problem is, when i flash or replace the backup bin file in my chip bios ( winbond ), the t450 lock on black screen ..
If anyone can help me or give me information about my flash.. i will thank him.
i would tell you that i have unplug battery ( the both ), Cmos battery, and RAM during the dump and flash bios.
i wish i will understand my text.
sorry and thks in advance.

ps: i can give you my dump file if you want to analyse it .. thks again.