Lenovo Ideapad 305-15ibd weird problem

[JustX]

Hello

this laptop came to me with "no display" "no boot" problem.
i changed kbc and programmed both kbc and bios and i got the laptop to boot

here is the problem :
when i change settings in bios from uefi to legacy laptop restarts and wont boot again till i reflash bios file.
i tried couple of bios and ec from this from and other places. still the same
and i found another bios , in this file legacy was enabled but graphic was uma only when i changed that to switchable graphic, laptop restarts and wont boot again.

any idea?

board model :
LA-B091p Rev:2.0

back up bios attached

[peste]

Re: Lenovo Ideapad 305-15ibd weird problem

Hello

this laptop came to me with "no display" "no boot" problem.
i changed kbc and programmed both kbc and bios and i got the laptop to boot

here is the problem :
when i change settings in bios from uefi to legacy laptop restarts and wont boot again till i reflash bios file.
i tried couple of bios and ec from this from and other places. still the same
and i found another bios , in this file legacy was enabled but graphic was uma only when i changed that to switchable graphic, laptop restarts and wont boot again.

any idea?

board model :
LA-B091p Rev:2.0

back up bios attached

bios si EC extras din actualizarea site Lenovo

[JustX]

Re: Lenovo Ideapad 305-15ibd weird problem

bios si EC extras din actualizarea site Lenovo

thank you, i programmed these files still th same problem, is it possible that upload this bios with legacy enabled already, maybe that works

[SMDFlea]

Re: Lenovo Ideapad 305-15ibd weird problem

What are you changing to legacy for,what OS version are you tring to install

[JustX]

Re: Lenovo Ideapad 305-15ibd weird problem

What are you changing to legacy for,what OS version are you tring to install

this laptop is for a customer and the hard disk is full of files and has a windows already, it boots with legacy support only, otherwise i have to back up the files then change the partition table and install windows again.

[SMDFlea]

Re: Lenovo Ideapad 305-15ibd weird problem

Is the bios you posted the original one, do you have the serial number

[JustX]

Re: Lenovo Ideapad 305-15ibd weird problem

Is the bios you posted the original one, do you have the serial number

i think its the one that i backed up from motherboard
or maybe this is the one.
i never had this problem is it possible its not the bios file ?

[JustX]

Re: Lenovo Ideapad 305-15ibd weird problem

i reflowed pch and the problem solved.
thank you for your help