The 1900 series is based on a 500 MHz PowerPC CPU with 512 MB of DRAM (max). While 15.7(3)M9 is the last official release, consider whether you should upgrade hardware instead.
If you are looking for a "fix" because your router is stuck in ROMMON: C1900-universalk9-mz-spa-157-3-m9-bin Fix Download
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