** DISCLAIMER: I AM NOT A DEVELOPER. I DO THIS AS A HOBBY AND SHARE MY FINDINGS IN CASE SOMEONE ELSE FINDS THEM USEFUL. **
** THIS WORKED ON MY DEVICE BUT IT MAY NOT WORK ON YOURS. APPLY AT YOUR OWN RISK **
** THIS WORKED ON MY DEVICE BUT IT MAY NOT WORK ON YOURS. APPLY AT YOUR OWN RISK **
This post shows you how to upgrade your system to a rooted lollipop 5.1.1 OS (latest version 14.6.A.1.216 as of Nov 6 2015) This is tested on C6833 model. For other models see the troubleshooting section near the end of the post.
Requirements:
Flashtool 0.9.18.6. or 0.9.19.6 or higher Important: Do not use Flashtool 0.9.19.0.
If you want to root the phone: Rooted XZU on any previous Android version with custom recovery installed.
This works on locked or unlocked bootloaders and any customization.
Download links:
5.1.1-14.6.A.1.216-system.zip (based on the Customized DE firmware):
https://mega.nz/#!JwkDmJJZ!olWK1SjvjVfLwUjNMZ7sSdnMhBoOT4ov6SWk2650Di8
C6833_14.6.A.1.216_No_System_No_Simlock.ftf
https://mega.nz/#!gxE3SDYQ!0hPC6ZDQBVGPttwAcWqR1umdFlxS4LbWJ82BMx2uyD8
Instructions:
0- If your existing system is rooted using Kingroot read the troubleshooting section below before continuing.
1- Back up your internal SDCARD and your apps.
2- Download C6833_14.6.A.1.216_No_System_No_Simlock.ftf and 5.1.1-14.6.A.1.216-system.zip.
3- Copy 5.1.1-system.zip to your phone's internal SDcard.
4- Reboot to recovery and install 5.1.1-14.6.A.1.216-system.zip.
5- Turn the phone off and disconnect it from PC.
6- Open Flashtool and click on the flash icon. Choose flash mode.
7- Navigate to where you saved C6833_14.6.A.1.216_No_System_No_Simlock.ftf and flash this ftf with your phone in flash mode. I recommend wiping apps and cache and data (Note that wiping data will erase your internal SDcard too). To put your phone in flash mode, hold the volume down button when it is off and connect with the USB cable to the PC.
8- Reboot.
Troubleshooting, etc.
This procedure works only if you follow every step carefully. When you are done you can easily test your root status in a terminal emulator or via adb. Please see the attached image.
If you have used Kingroot to root your existing system flashing this ROM may not work and it may leave your system with a partially updated file system that may be broken. The reason is that Kingroot (which in my opinion is malware) makes some of your system files immutable which means they cannot be removed during a software upgrade. To proceed, you should either find a way to replace this horrendous piece of code with SuperSU or downgrade to Kitkat 14.4.A.0.108, use ZU-lockeddualrecovery2.8.21-RELEASE.installer to root and install the recovery at the same time, then follow this guide.
I don't know if this works for C6802 or C6806. You can try and follow this guide and use the zip file posted here. The only difference is that instead of flashing the ftf posted here in the next step, you use the 14.6.A.1.216 stock ftf for your phone and exclude system.
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