Jeep GC 4.7 99 JTEC

Hello everyone. I Heav problem with JTEC pcm in jeep grand Cherokee 4.7 99. I can read parameters but I can?t save changes. I don't see any information about unlocking the PCM for writing. Someone explain where is problem ? Thx for answer. Best regards

On my 04 I have to use the beta vcm editor. Put it on a battery charger while tuning. And don't touch the mpvi3 while tuning. Mine has lost connection from being bumped. I use a long cord and don't get in the Jeep when writing.