X230 stuck on 2.75 - I cannot downgrade to 2.60!

[brunocek]

I think I got myself in trouble stuck on 2.75 - I cannot downgrade to 2.60 (X230) via IVprep or the lenovo tool (I get "This app can't run on your PC"). Is there a way forward, please?

Here is what I did and was planning to do (1vyrain, skulls and clean/disable/break the Intel ME):

1. EC Patching (accept all batteries and keyboards)

https://github.com/hamishcoleman/thinkpad-ec/
It recomends using on the last modifiable version: x230 -BIOS 2.75 (G2ETB5WW) EC 1.14 (G2HT35WW)

Therefore I upgraded from my 2.55 to 2.75, by downloading g2uj31us.exe, saving on a usb stick and running on the target machine's windows (the bootable iso would not dd well to the usb stick).
https://support.lenovo.com/ec/en/downloads/ds029187

2. Downgrade from 2.75 to 2.60 (X230) (I cannot perform from here onwards):

https://github.com/n4ru/IVprep/tree/master

Downloaded both IVprep and g2uj17us.exe and saved on the usb stick to run on target machine's windows but then I get I get "This app can't run on your PC".

I have tested with both:
BIOS Setup -> Security -> UEFI BIOS Update Option. Set Flash BIOS Updating by End-Users to Enabled, and Secure RollBack Prevention to Disabled
BIOS Setup -> Security -> UEFI BIOS Update Option. Set Flash BIOS Updating by End-Users to Enabled, and Secure RollBack Prevention to Enabled

3. Get rid of the ME

https://github.com/corna/me_cleaner
I gues for this one, I should boot the target machine with a Live Linux, clone the repo and execute

4. Install Skulls via 1vyrain

https://github.com/n4ru/1vyrain

This would be burn the usb stick to the 1vyrain, use the ethernet cable and the skulls release URL
https://github.com/merge/skulls/releases

This question has been also posted on:

• 1vyrain, skulls and clean/disable/break the Intel ME n4ru/1vyrain#144
• https://forum.qubes-os.org/t/how-to-use-ivprep-and-1vyrain-and-disable-intel-me-on-a-lenovo-x230/18162/5
• 1vyrain, skulls and clean/disable/break the Intel ME merge/skulls#302