This is the hardest part. You cannot simply download a generic "Windows 7 ISO" from Microsoft anymore, as those links have been taken down or require a retail key.
The COA Sticker: Look for the Certificate of Authenticity (COA) sticker on the bottom of your laptop or under the battery. It will explicitly list "Windows 7 Home Basic OA LATAM" and include a 25-character product key. windows 7 home basic oa latam lenovo
Because this is an "OA" version, you cannot use a generic MSDN ISO. You need a Lenovo OEM ISO. This is the hardest part
Let’s break down the keyword phrase:
