Battery was put in backwards now it will not start?

So, my battery drained on me, so I went and got a new one. Well, someone put it in backwards and it sparked some so once put in correctly it’s misfire with cylinder 5 and riding really rough. I was able to take to auto sone and get read and it said it’s lost communication with my power train module body control module transfer case module and transmission control module then my battery died again I charged up and it won’t start. I ordered an ECM preprogrammed and still won’t start. My truck has been down for 5 months, I don’t know what to do. Checked all the fuses in fuse box they are all good.