HI, If you have problems with your 6515 firmware, then you can use these two files. Also they can be used for downgrading from other version.

Step 1:Copy the updated firmware data to the root directory of
USB flash disk (Recommendation: do not save other files to the flash
disk);

Step 2: Turn of the machine

Step 3: Plug USB flash disk into MPC6515

Step 4: Turn on the machine

Step 5: After about 1 minutes, remove the USB flash disk, DSP firmware program will be started.