new here, gen 1 problems, no ready light, won't start

cars history. ain't got any of it.
How I got it. Impound sale. no keys.
how it's going pulled lockset and imobilizer ECU (that little bugger is hard to get with big hands)
installed the ingnition lock assemby and ECU. key turns on dash, lights up and flashing red security light stops.
Found car had sat since 19.. high voltage battery, not so high. Found prolong charger in truck charged overnight. battery no good sever packs very low voltage (probably why it's been sitting) went to my favorite salvage yard and they gave me a remaned pack that sat to long and was dead. No problem the prolong can charge it.. installed the pack and connected the 2 prolong leads the same way (and per their directions) charged battery over night.
the red triangle is gone. Icon T10 (launch basically) says all systems are happy. No codes present in anything (after clearing a P3006 I think it was)
still won't ready or start
12 volt battery sitting at 12.8V stays at that when I turn key to "start" but the info screen goes dark (the odometer screen stays list)

access the data stream from the ECM one line bugs me Start=Proibitied.

but there is nothing telling me why. Not sure where to go from here.

Thanks!