As in the earlier post, the only way you are going to get the original data packet without possibility of error is to obtain it directly from the node, probably by adding some debug output to the code that loads the packet into the radio.
Don’t forget about the 4/5 coding…
But note that your question really has nothing at all to do with this thread, since you are apparently interesting in seeing when a packet changed while going over the air, rather than trying to decode LoRaWAN contents of valid packets.