C800universalk9mzspa1583m9bin Work !link!

If you are managing legacy Cisco 800 series hardware and need a firmware that without frequent reboots or VPN drops, 15.8(3)M9 is a solid A-tier choice.

The c800 series routers (like the C891F) were workhorses for the "Work From Home" and Small Branch era. c800universalk9mzspa1583m9bin work

Ensure at least 65 MB free.

Or at boot: