Trigun, please read the big, bold brown WARNING on the first page about 5.15.1.1.
https://www.mobileread.com/forums/sh...d.php?t=320564
Technically, the JB process injects a third-party certificate into the system certificate wallet at a specific location.
Now in 5.15.1.1, they change the wallet location, which will break the JB bridge (which still tries to mess the wallet at the old location, but the new software doesn't read from the old location anymore). So it doesn't matter anymore whether you did JB or not.
Until the JB bridge is updated, then better to stay at 5.15.1.