it seems like a problem on JB 4.3 because I couldn't write a file to the /system/app destination. es file manager replies me that there are not the proper access rights to write a file. If I try to install 6.14 from a different location, the installation process starts proper with questions about access rights on my device, then it stops with "x - not installed".
With JB 4.2. ist was simple. I just deinstalled the update to 7.x then the original 6.x version was available. I hope anyone have a suggestion for me