C1900universalk9mzspa1583m7bin Better -

Ensure your router is a Generation 2 (G2) ISR (e.g., Cisco 1921, 1941). This file will not work on older 1800 series routers.

Router# configure terminal Router(config)# no boot system Router(config)# boot system flash:c1900-universalk9-mz.SPA.158-3.M7.bin Router(config)# end Router# write memory Use code with caution. Step 6: Reload and Test Operational Continuity c1900universalk9mzspa1583m7bin better