Hi,

I have problem with battery replacement. Everytime I get error that battery is not original and It wouldn't charge.
I cannot download any older version of BIOS than the newest one J7ET63WW (older: J7ET54WW - J7ET62WW).
Does anyone have access to older versions and have knowleadge that I will be able to downgrade it?

FN + S + V - does not help. On second boot I still get message and even on the first boot battery does not charge (at least in Windows I get the error).

Lenovo B5400
SN: QB07853765
PN 59399254
MODEL NAME: 20278...

I work as certyfied Lenovo technican. I'm a little bit interested in electronics but I do not have much experience. I look for some help with Lenovo bioses