Cannot get prius into neutral. All gears flashing

Hi all

Bought a 2008 prius with 263k

Previous owner said it drove fine 4 years ago but has been sitting

We put a new hybrid battery pack we had from another in

We put a new 12v in

The car just flashes the gear selectors

Won't go into neutral


The relays of the hybrid battery do not click

I checked all the micro fuses in the engine fuse box and they are all good (including the AM2 fuse)

Anyone have the same thing?