On a Lenovo Yoga 2 13 an older version of the Bios and EC firmware was installed.
When reading out the Bios Rom with a bad CH341-HW-Flasher I damaged the Rom:
Lenovo was brick dead.
Now I found a backup copy of the Bios-Rom 1.17 for this computer on my hard drive,
which I created times ago with the Insyde H2OFFT-tool. (I have to say that I downgraded Bios in the hope that it would accept another wifi card)
After installing a new bios Rom which I flashed with the backup I could switch on the laptop, keyboard lights turn on and fan briefly spins up but screen stays dark and device does not boot further. However the laptop can be turned off what was not the case with the dead rom.
When turning on, short traffic at the Bios-Rom pins (CS,SO,SI,CK) can be observed with a cheap oscilloscope.
My assumption (and hope) is that Bios-version and EC-version must match. Is this correct? Unfortunately I do not have a backup of the EC nor of the older Bios firmware.
Could I get an older version of the EC firmware?
Is the EC firmware also customized?
How could I flash it?
Or how could I customize an older version of the vanilla rom from Lenovo page with the data from the backup version?
Maybe my assumption is completely wrong and there is another fancy security feature (UEFI) that prevents from booting...
When reading out the Bios Rom with a bad CH341-HW-Flasher I damaged the Rom:
Lenovo was brick dead.
Now I found a backup copy of the Bios-Rom 1.17 for this computer on my hard drive,
which I created times ago with the Insyde H2OFFT-tool. (I have to say that I downgraded Bios in the hope that it would accept another wifi card)
After installing a new bios Rom which I flashed with the backup I could switch on the laptop, keyboard lights turn on and fan briefly spins up but screen stays dark and device does not boot further. However the laptop can be turned off what was not the case with the dead rom.
When turning on, short traffic at the Bios-Rom pins (CS,SO,SI,CK) can be observed with a cheap oscilloscope.
My assumption (and hope) is that Bios-version and EC-version must match. Is this correct? Unfortunately I do not have a backup of the EC nor of the older Bios firmware.
Could I get an older version of the EC firmware?
Is the EC firmware also customized?
How could I flash it?
Or how could I customize an older version of the vanilla rom from Lenovo page with the data from the backup version?
Maybe my assumption is completely wrong and there is another fancy security feature (UEFI) that prevents from booting...
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