Was it in the process of loading .52 while the hourglass was spinning? That process can take 45 mins or longer. I have seen users on here say it took over an hour.
You just have to be patient. DON'T DISCONNECT during the OS install.
Try to wipe with JL_Cmder and load the OS again. How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ What to do next if Jl Cmder will not connect and wipe - BlackBerryFAQ