Lenovo Yoda 8″ 851F bought from Amazon Japan. Cheaper by over 13000 Yen because the seller took out the Office 365 1 year for resell.
The original Windows 8.1 with Bing, I installed English language pack over the default Japanese language but some of the words are still in Japanese. After upgrade to Windows 10, deleted the default partitions and Windows 8.1 backup files, so no turning back.
Windows 10 was really not my cup of tea. So I reinstall a 32bit Windows 8.1 ISO file from Microsoft.com. However the serial key back up from the original Windows 8.1 is not working.
Further checking I found the only ‘official’ way to get the Win 8.1 with Bing is from the device’s manufacturer, in my case Lenovo Japan. I do not intent to do that, of course.
http://forums.mydigitallife.info/threads/56755-Windows-8-1-with-Bing-AKA-CoreConnected-CCSL-and-ProfessionalStudent-OEM-images has the Windows 8.1 Bing ISO, but it is only available for torrent download, which my ISP TM Malaysia Streamyx has blocked.
Next I found it on http://www.linxtablet.co.uk/page.php?p=downloads—windows-81-bing&sid=ad908ed3eafdbd149ed7c8018a56e3af
After download and make sure the SHA1 checksum is correct (matching checksum from mydigitallife.info), I use Windows 7 USB/DVD Download Tools to burn the ISO into a bootable USB drive.
Start my Yoga tablet2, press and hold volume up while press the power on button, go into BIOS, disable secure boot. After that select USB drive as boot device, run SETUP.exe and viola! Windows 8.1 bing setup continues without even asking for the serial key.
Continue the rest of the setup, hopefully no more problem.. now just worry on the drivers part 😉