Other than rooting and debloating, no changes have been made. Since Sony hasn't released the official non-branded jelly bean version for LT28i, this rom/mod should help the users.
Again, this is the latest prerooted Xperia LT28i Roger's Jelly Bean stock, which as of today still can't be rooted post installation.
WARNING: If you soft/hard brick your phone, it is NOT my fault. Do it at your own peril. If you feel like complaining, NSA might listen.
1. Enter Recovery;
2. Triple Format (format System, Cache, Data)
3. Flash Roger zip.
If you were on JB Kernel before, you are done, just Reboot and enjoy.
If you were on ICS, don't reboot, instead turn off your phone and do the following:
4. Flash JB Kernel from either Rogers or LT28h stock ftf. Untick everything and exclude everything, but kernel.
This is the download link:
To download, put your cursor on the file and click the arrow/download button on the right.