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Have you tried jumpstarting or another 12V battery? The question is some what unclear on this end.
Yes I have tried fixing a new 12 v battery hoping to start the car with it but yet, the car wont crank nor start, secondly the KEY get stuck in the cylinder, unless i disconnect battery terminal or unplug the key sensor cable beneath the steer while before i can take off the key..
the gear lever is not shifting to P, but move in between R and N but wont get to D and B as well
P3120 is a HV transaxle malfunction, the main system relay or transaxle has failed. P3030 is the battery voltage detective line snaped, the battery ecu has failed, or open circuit in battery voltage detective line, or the wire harness bussbar. Both codes are related to the high voltage system and I would recomend having a dealer perform further diagnosis.
You will have to perform some diagnostics in the high voltage system. I am certifed by Toyota for hybrid vehicles and work on them daily. If you are not fimilar with the hybrid high voltage system performing the required diagnostics can be extremely dangerous and potentially deadly. If you wish to continue working on your car I will opt-out so other experts may help.