X230 BIOS downgrade from 2.77 to 2.6

Easy downgrade, no hardware mod and just typing some easy command in command prompt. The stupid Lenovo tries to prevent you guys to downgrade BIOS.

1. Download BIOS update file ver2.6 (.exe) from Lenovo (https://support.lenovo.com/us/en/downloads/ds029187-bios-update-utility-bootable-cd-for-windows-10-64-bit-81-8-7-32-bit-64-bit-xp-thinkpad-x230-x230i)
2. Execute the downloaded file.
3. You will get an error saying like 'system number does not match blah blah blah'. Just exit the program.
4. Go to C:\DRIVERS\FLASH\g2uj17us just created
5. Go to command prompt, winflash64.exe /sd /file C:\DRIVERS\FLASH\g2uj17us\G2ETA0WW\$01D3000.FL1
6. The computer will reboot and flash the version you want accordingly.

You have to use BIOS ver2.6 to remove the whitelist checking.

電腦重裝

忍唔住都係要寫低 notes，做褔自己同後人。話說家中有一台不快不慢不新亦不太舊的一台電腦。底板係 ASUS P7H55-M。由於不能正常住入 windows 7，故勞動家妹幫忙重裝系統。當中過程不太難亦不易。唯當中有兩個重點。
1. windows download tool 唔識 format mbr，當佢睇有 mbr 唔係空白時佢就會 prompt error 話抄唔到。可以用 disk part 去處理佢。
2. 唔知點解個 bios 唔識認 usb thumb drive 做 bootable device。 小弟上次用 usb cdrom 避過問題。呢次終於搵到 root solution。就係喺 advance --> USB Mass Storage Configuration --> Emulation Type (AUTO) --> HDD。再係 boot sequence o既 HDD 度揀 USB thumb drive。 再 save and exit 就應該可以順利 boot from USB thumb drive

或者，可以試可係 POST 畫面按 F8 睇下有無得揀 boot device by manual。

報告完畢。