Here are some steps you can try:
1. Restart your Sony Xperia phone: Sometimes, simply restarting your device can fix the issue. Press and hold the power button until the "Power off" option appears, then select it and confirm. After your device has restarted, check if the "UI has stopped working" error persists.
2. Clear the cache and data of the UI app: The UI app may have corrupted data that causes the error. Go to Settings > Apps & notifications > See all apps > UI > Storage > Clear cache. If that doesn't work, go back to Storage and select Clear data.
3. Uninstall UI updates: If you recently installed UI updates, it's possible that they caused the issue. Go to Settings > System > System updates > System software update > Uninstall updates.
4. Reset your Sony Xperia phone: As a last resort, you can reset your device to its factory settings. This will erase all your data, so make sure to back up your important files first. Go to Settings > System > Reset options > Erase all data (factory reset).
system ui crashed and wont turn on - Sony - Comunidad
Sony
https://community.sony.es > m-series > td-p
... Xperia Companion. This will do a clean installation of the latest ... August 2017.
August 2017. Keep getting " unfortunately UI has stopped working" message.
..
SOURCE: Sony vegas crashesat Initalizing UI
I had this problem once and it was after I tried to fix my registry with one fix all software utilities. In the end I actually had to re-install my operation system. There probably is a better solution, but that one was the one that worked for me.
SOURCE: HUAWEI U511 Launcher has stopped.
boot into recovery and factory reset... or flash a new one. this isnt your exact model but it may work http://kyawzayarmin.blogspot.com/2013/09/y511-cwm-recovery.html
SOURCE: I want know original sony xperia pjone
The first Xperia phone was the Xperia X1 released in 2008 followed by the X2 in 2009.
SOURCE: Unlock my cell phone. It's Xperia phone by Sony
If I were you, I will use applock to lock my apps, because, when I forget my password I can also reset my password.
LEO Privacy Applock Hide Safe Android Apps on Google Play
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