[Sony Xperia C4 Questions & Answers] Heavykill96:
So i brought the phone about 3 months ago in Best Buy orlando everything was doing alright but yesterday y updated the phone, i was thinking about rooting it. I've always rooted my phones (moto g 2013, 2014, and 4g, samsung s3 s4 trend ) soo i know what i was doing, but then i downloaded the update via wifi and oficial sony notification, all worked good but then my phone restarted and then was where the problema begin, it showed me my a black page where all i can do is doing Autenticate, wifi settings and emergency call, ok they copping icloud what a pitty, everything good from that point, nice system against the thiefs but when i try to autenticate my username and all i clicked the option AUTENTICATE and a pop up show saying "My xperia helper desafortunately has stopped working" thats it, it doesnt let me do ANYTHING not even put a mail nothing i ve found some solutions but they didnt work i will leave them here so anybody can try and see if they work, no one worked for me, anybody got it ?

Here you can see your device but you cant locate it, nor play a sound, not anything ( coppying icloud and failing at it) https://myxperia.sonymobile.com/

First "solution" you would need the PC companion

"Para hacer una reparación de software usando una computadora con Windows (To make a software repair using a PC with Windows)

1 Make sure not to have your device connected to your PC and make sure it's charged, it's preferable being 100% charged. Go to http://support.sonymobile.com/global-es/xperiam/tools/pc-companion/ and install PC Companion in your PC.

2 Disconnect your device from the computer. Ignore any instruction of connecting your device to the PC until step 11.

3 Hit "Update Mobile/Cell phone or Tablet. Select "Start"

4 You'll read "The device coluldn't be found". Select "Repair my phone/tablet.

5 If asked, select your device and click on Next. if not, go to step 7.

6 You'll read a warning about losing your personal data. Accept that all data is going to be overwritten. Select "Next"

7 Mark the box to confirm that you have understood that you're going to lose all personal data, next, click Next. The application is going to prepare the update and, if necessary, download information from Internet. (This step took me ages, so try using a wired connection for making it faster, it's tons of info downloaded)

8 You are asked to follow instructions and, if necessary, make the poper steps to update the software of your device. DON'T CONNECT THE DEVICE YET! Mark the verification box and click Next.

9 Make sure your device is not connected to the PC. Verify that your device battery is at least 80%. Click Next.

10 If asked, select your device from the list and click Next. If it's not on the list, go to step 12.

11 Make sure your device is turned off and disconnected from the PC.

12 Connect ONLY the USB wire to the PC.

13 While you keep the indicated key, connect the USB to the device (it's the volume down key... KEEP IT PRESSED!!!) and keep the key pressed until you see the following message "The update for your device has started)

14 When the update has started, you'll read "stop pressing the key" indicated in step 14.

15 If you don't follow the step correctly, your device is going to turn on. If this happens, disconnect the device from the computer and start all over again from step 13.

16 Wait until the fixing procedure finishes. When it's finished, disconnect the device and turn it on again.

17 On your PC, click Next. If the fixing was correctly done, you'll read the following message "Your device has been updated". Click "End".

Second solution

you would need Flashtool witch comes with xperifirm you have to download flashtool from here (it has to be the last version) download the firmware in xperifarm and then proceed to flash it

Last solution

ONLY FOR US RESIDENTS, talk to the support of sony and they will tell you to deliver it to a Tecnic service

FOUND THE SOLUTION

Ok as i say in second solution, you would need Xperifirm downloading version 27.1.a.1.106, then dowload it and let it create a bundle HERE COMES THE TRIKY PART you have to choose the MAX USB BUFFER to the lowest *128K*, push flash and you are ready to go, dont panic it will take a time to restart the cellphone after you do it, glad to see sony doesnt care about their customers. Cheers for your phone again back at use!