Rom for the one of the best phone of it's time Xperia™ U
The above phone is from nxt series of Sony Xperia™ Smartphone. It is very low end device but though it has good graphics chip so you can play good amount of games, But the main problem is it's rom, and that is our today's topic there are many roms for this device what to choose.
If you want just good look and stock experience then we would suggest you stock rom gingerbread 2.3.7. It is good fast, reliable and pretty good sony flavour.
Now if you are looking for some custom roms then lollipop is also available for xperia u but it's in developing phase so then you may try Kitkat it works pretty well.
This is the original page and developer of the rom.
This is only for UNLOCKED BOOTLOADER
It features all z2 functions mainly.
Download link(MEGA)
Installation Guide
1. First extract boot.img file from the rom, copy the rom to your phone's sd card (internal storage)
2. Flash it using fastboot with flashtool
3. Now, reboot to TWRP recovery
4. Wipe dalvik cache, wipe data and wipe cache
5. Now, Flash the zip.
First boot will take some time so patience is the key.