Help with programming

Hide quoted textGood eve, My name is nate I have a repair ship in sw pa here uniontown to be exact I have a 2000 chevy express in for a start stall issue found out that the map sensor wasn't reading correctly however power , ground and signal back to the ecm was correct however the ecm was not interrupting it correctly has skewed map reading , so I have a done truck outside that I swapped the ecm with , now runs fine and map reads correctly , got the ok on a new ecm , "autozone reman " I installed and I started it and it stalled so I did the 3, 10 min programs for the key learn sequence truck would start and run I decided to drive it but the transmission was not shifting correctly, so brought it back hooked up to it via laptop and snap on pass thru , techline connect went to program it downloaded the flash but when it went to flash I got error codes for cyber security and what not , now nothing will connect to the ecm like its not plugged in , threw the doner back in starts right up I'm just confused to what could of happened here I apologize for trying to get ahold of you here just wasn't sure how else to get too you or anyone else that would know or have an idea what to do thanks in advance have a good evening . Nate  

I'm no expert, but the times that I have had trouble with SPS were due to poor internet connection (sometimes my hotspot just isn't up to the task), or low battery voltage/wrong battery charger. (The big wheeled ones at my shop make a lot of ripple). I wouldn't say that's definitely what's going on in your case, but it's worth mentioning.
Maybe someone who does more programming can help define that specific error for you better than I can.
Let us know when you get it sorted out.