This is the link of the bios from the acer website
http://global-download.acer.com/GDFiles/BIOS/BIOS/BIOS_Acer_1.26_A_A.zip?acerid=635608933109070617&Step1=NOTEBOOK&Step2=ASPIRE&Step3=ASPIRE%20E5-571&OS=81P1&LC=en&BC=ACER&SC=PA_6
http://global-download.acer.com/GDFiles/BIOS/BIOS/BIOS_Acer_1.26_A_A.zip?acerid=635608933109070617&Step1=NOTEBOOK&Step2=ASPIRE&Step3=ASPIRE%20E5-571&OS=81P1&LC=en&BC=ACER&SC=PA_6