Reference:Programming and PCM0902

Note: If you do not have the Softboot developer permissions checked in MotoTune, MotoTune will automatically select the correct softboot file for you to use.

The latest softboot for PCM0902 is 1.12 (released with 8.13.1.280). If your hardboot is 1.09; this softboot will not work for PCM0902; hardboot prior to 1.10 (1.09 included) does not have the serial components in place. For older versions of the hardboot, the softboot you will need to use is 1.07, or upgrade the hardboot of the module to 1.10.