for upgrading older NX-OS 6.x software to newer versions like 7.x or 9.x Key Download & Integrity Details Official Source : The most reliable way to obtain this file is via the Cisco Software Download System Image Requirement
This specific release (6.0(2)U6(10)) acts as a mandatory bridge for major upgrades n3000-uk9-kickstart.6.0.2.u6.10.bin download
To ensure device security and software integrity, images should always be sourced from the Cisco Software Download portal. for upgrading older NX-OS 6