Navigating Cisco’s ecosystem of firmware and software packages can be a nightmare—even for seasoned network engineers. You’ve just downloaded a fresh IOS-XE or NX-OS image from Cisco’s Software Download portal. The file extension is .bin . But your ASR 1000 router or Catalyst 9000 switch is stubbornly refusing to accept it. The error message is cryptic: “Invalid image type. Expected .pkg format.”

Expanding file flash:cat9k_iosxe.17.09.01.SPA.bin Extracting packages: cat9k-cc_17.09.01.SPA.pkg ... OK cat9k-espbase_17.09.01.SPA.pkg ... OK cat9k-routing_17.09.01.SPA.pkg ... OK packages.conf (updated) ... OK Expansion completed successfully. Converting BIN to PKG is useless if you don’t change the boot variable:

switch# show version | include Mode You should see: INSTALL Mode (not BUNDLE Mode ). | Aspect | Manual extraction | Cisco expand command | |--------|------------------|------------------------| | Preserves crypto signatures | ❌ No | ✅ Yes | | Creates packages.conf | ❌ No | ✅ Yes | | Supports ISSU later | ❌ No | ✅ Yes | | TAC-supported | ❌ No | ✅ Yes | | Speed | Slow (copy errors) | Optimized | Part 4: Advanced “Better” Techniques – For Large Deployments Doing it on one device is fine. But what if you have 50 switches? Manually expanding BINs on each one is inefficient. Here’s how to convert BIN to PKG better at scale. Technique A: Offline Expansion Using a Virtual Machine Run Cisco’s IOS-XE in CML (Cisco Modeling Labs) or EVE-NG, expand once, then copy the PKG folder to all devices.

Now go forth, expand those BIN files, and leave bundle mode in the past where it belongs. Have a unique conversion scenario? Leave a comment or contact your Cisco TAC engineer – but only after you’ve followed this guide.

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