Once you have the ISO (verify its SHA-1 if available from trusted sources):

Lenovo OKR is not a "one size fits all" tool. There are specific builds of OKR8 for specific model lines (e.g., Idea vs. Think series). Using an ISO intended for an IdeaPad on a ThinkPad can result in boot failures or partition table corruption. The software checks BIOS markers (SMBIOS) to verify the machine is a supported Lenovo product. If the checksum fails, the software will not run.

(often referred to as the "Engineer ISO") is a powerful tool used for manually creating factory recovery partitions, it is not an official consumer download provided by Lenovo for end-users. Informative Review: OKR 8.0 Engineer Edition

If you just need to restore your Lenovo to factory settings, consider these methods:

Введение в Lenovo OneKey Recovery 8.0 для ноутбуков

When searching, you may encounter filenames like:

A quick search for the ISO will yield results on various file-hosting sites, tech forums, and torrent trackers. However, downloading these files carries significant risks that every IT professional must consider.