How to restore system apps uninstalled by Titanium backup

Hi, everyone,

I uninstalled some system apps by Titanium Backup and cannot restore them.

• com.android.bluetooth 4.4.2


• org.codeaurora.bluetooth 4.4.2

I didn't know system apps cannot be restored after uninstallation by Titanium Backup. Googling on the web and this forum didn't solve the issue. I need these apps to use a bluetooth keyboard.

How would you solve this problem? Thanks in advance!

[My environment]

• Model : Sony Xperia SO-04F


• Android version : 4.4.2


• Kernel version : 3.4.0-perf-g0ce556e