Impossible to find the key to enter the bios on the pc B50-70

hello I do not find the key to enter the bios on the pc I have B50-70 essyé F1, F2 and Del but it does not work

Good day and welcome to the community.
Have a look at page 10 of: https://download.lenovo.com/pccbbs/mobiles_pdf/b40_b50_ug_en.pdf
Do you see item #3 (Novo button) on the right-hand side of your laptop? If you push it briefly while the laptop is fully powered off, it should boot to a small menu that has entering BIOS as one of the choices.
Please let us know if this helps.
Regards.

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