Unhappy Unrooted My xperia C but deleted some Inbuilt app,now want them back but how ?

Hello, I have rooted my Xperia C and It was 1st time that i rooted my phone , but after rooting it I found that it has become complicated for me to use rooted phone,as I am not having any knowledge what to do after rooting my phone. So I decide to unroot it, but I already deleted my some in-built apps without doing backup of them . I have tried every thing that I could do to bring my phone to stock and claim warranty , but I was not able to succeed in any method that I tried..

Following are the methods which I tried to reset my phone and to bring it to stock-
1- done factory reset - (not worked)
2- try to reset using PC Companion but now PC Companion is not detecting my phone
3- At the end I thought of fixing this issue using FLASH TOOL , I have the new Android 4.2.2 16.0.B.2.6 firmware.ftf update of Xperia C, but when I tried to install it using the flashtool, it also not working at all. When ever I starts flashing it getting abort again and again...


I am really confused what should I do now I tried every thing ...Please help me if any one can tell what I should do now???
I haven't unlock mu boot loader, I just rooted my phone and deleted some in-built apps now I unrooted it, so Should I go to service center to claim warranty ??? please help me and a very big thanks In advance.....
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