HELP! Inverter box wire harness damage / codes U029A U0100 P0B3D P0A80

2012 224k miles here

The car worked then was parked for a while then wouldn't start with the check hybrid system park in safe place message.

After inspecting I found what looked to be chewed up wires in the wiring harness going into the inverter converter box. Seems to be from rats/mice?

These are he codes:
1. U029A - lost communication with hybrid battery pack sensor module
2. U0100 - lost communication with ECM/PCM
3. P0B3D - hybrid battery voltage sense "A" circuit low
4. P0A80 - replace hybrid battery pack

The voltage on the hybrid battery pack seems to be fine. I originally tried reconnecting the wires that were damaged on the harness, six total. The car still didn't start, so I cut off a harness from a Prius at a junkyard, and reconnected every wire one at a time, 27 total. Car still isn't starting and showing all the same codes.

Been searching and can't find any other damaged wires. My neighbor is an auto mechanic and I was showing him everything. He called a Toyota dealership and said that if you get a warning message where the car won't start, you have to get the car reprogrammed with some $10,000 machine that they have. Sounds kind of sketchy to me, is this a real thing?
Clearing the codes does not work either.
Please help, landlord is threatening towing the car for how long it hasn't been running.

 

I thought the reprogram seem to pretty sketchy, especially since I couldn't find any information on this supposed reprogramming after repair anywhere online...

 

I don't remember how long it was sitting total, I'd say several months.
I will have to check each cell individually, but I think it did total 210 volts.
I already replaced the 12v

 

It's not that kind of tow