Sienna Soldier

Hi, Has anyone gotten this problem? Is ECM 89661-08061-84 glitched? If so, how do I solve this problem? Thank you Here is my story, I bought an used car 2001 Sienna LE without engine immobililzer system. I wanted to upgrade my ECM (89661-08061). The dealer installed this new REM ECM (89661-08061-84). However, with the new ECM, they were not able to start the van. Then he put back my old ECM to the van, and the van could be started again.