You ll have to contact TAC for this. Or else downgrade IOS, but i dont have a clue how u can figure out which version of 12.X.Y has dspware version 4.X.X.
DSPWare is bundled with the IOS, but if TAC asks you to upgrade DSPWare, they send you the file and you tftp the file to flash and reload the router. The router will start using the new DSPware. If you remove the dspware file from flash and reload the router again dspware should automaticallly downgrade to what is bundled in the IOS.
If you contact TAC, they can provide you and DSP firmware that you need to tftp to flash. After this, all you have to do is reload the router and upon bootup, it will recognize that dsp file and downgrade the dsp firmware.
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