C1900universalk9mzspa1583m7bin Better -

: By optimizing how the Cisco 1900 utilizes its resources, this firmware helps extend the life of your hardware without requiring a costly replacement. Key Enhancements in 15.8(3)M7

Update your boot system marker with boot system flash c1900-universalk9-mz.SPA.158-3.M7.bin . Reload: Save your configuration and reload the router. To help tailor further advice, please let me know: c1900universalk9mzspa1583m7bin better

Some users consider 15.8(3)M7 the peak version for this hardware because later rebuilds, such as 15.8(3)M9, were never released for the 1900 platform. : By optimizing how the Cisco 1900 utilizes