1. Download FXP114 ZIP and Gapps (if you cannot download 114, use 113) to SD Card
2. Reboot into recovery
3. Clean cache & dalvik cache
4. Install FXP114 ROM and Gapps114 or Gapps113, whatever you have
(means don't flash FXP114 IMG)
This worked for me, currently I am on ICS 4.0.4.
Changes so far:
EDIT:1. WIFI works better, but some dropdowns still experienced.
2. Panorama does not work (I do not matter.)
3. Videoplayback (Youtube) does not work (?)
Conditions Change. Results Should Not.
Xperia Z1 Compact | Xperia Z Tablet @ Rooted Stock 4.3 | Nexus 7 Tilapia @ XENON HD
Sony Xperia M | Samsung C3350 | Nokia C5 | Xperia Pro & Pausebreak 2.0.8. | Samsung Galaxy Nexus | HTC Desire S | LG Optimus One | T-Mobile G1 | ...and many many more RIP (Nokia | Ericsson | Panasonic | HTC | Siemens | Philips Fizz)