lb7 ecm tuning trouble

03 lb7...downloaded ecm cal has out of range c0301. got ecm tuned as needed with dsp5 os but it will not flash. It cannot erase ecm flash memory(reason:negative response $31). does this even when trying to flash stock file in. ive never had this issue before and don't want to go to far and brick the ecm. any help is much appreciated.

yes I do have most recent updates and have pulled fuses for different acc. will not even read ecm in high speed so its not being tried flashing either. truck starts and runs