I have seen this issue before and it was the thumb drive. Please try a different thumb drive. I have also had a couple people that tried a different USB port on their computer to download the file to.
I just noticed that this is the 2012 update thread, you mentioned that your truck is a 2011. Do you know what the build date is? This update may not be the correct one for you depending on that date. Thanks
Originally Posted by krazyram
I tried the update on my 2011 Dodge Ram 1500 with the RHB nav radio with uconnect and when it gets to the end of the update or what I guess is the end of the update it says used digital signature not valid or something like that. Whats that even mean?