It is following 8 guidelines showing HOW TO:
1. install the newest Android 5.1.1 (for Sony XPERIA T2 Ultra D5303 it is the 19.4.A.0.182 firmware)
2. install the newest Android 5.0.2 (for Sony XPERIA T2 Ultra D5303 it is the 19.3.A.0.472 firmware)
3. install the newest Android 4.4.3 (for Sony XPERIA T2 Ultra D5303 it is the 19.1.1.A.0.165 firmware)
4. install the newest Android 4.3 (for Sony XPERIA T2 Ultra D5303 it is the 19.0.1.A.0.207 firmware)
5. root Sony XPERIA T2 Ultra with locked bootloader (and than install the newest Android and recovery)
6. backup your original firmware customization (it is important in case you must send your phone to service)
7. unlock the bootloader (in case you want to install the custom kernels with recovery menu and more)
8. relock bootloader on your phone
1. how to install the newest Android 5.1.1 for Sony XPERIA T2 Ultra Dual D5303
a) first of all, check your firmware version (if you already have the newest one, you do not need this tutorial)
b) download and install latest Flashtool from this article
c) download also latest Android 5.1.1 (mirrors Google Drive) for Sony XPERIA T2 Ultra
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA Flashtool
e) open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
g) after few minutes all is done and your phone gets the new firmware
a) first of all, check your firmware version (if you already have the newest one, you do not need this tutorial)
b) download and install latest Flashtool from this article
c) download also latest Android 5.1.1 (mirrors Google Drive) for Sony XPERIA T2 Ultra
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA Flashtool
e) open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
g) after few minutes all is done and your phone gets the new firmware
2. how to install the newest Android 5.0.2 for Sony XPERIA T2 Ultra D5303
a) first of all, check your firmware version (if you already have the newest one, you do not need this tutorial)
b) download and install latest Flashtool from this article
c) download also latest Android 5.0.2(mirrors Google Drive) for Sony XPERIA T2 Ultra
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA Flashtool
e) open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
g) after few minutes all is done and your phone gets the new firmware
g) after few minutes all is done and your phone gets the new firmware
3. how to install the newest Android 4.4.3 for Sony XPERIA T2 Ultra D5303
a) first of all, check your firmware version (if you already have the newest one, you do not need this tutorial)
b) download and install latest Flashtool from this article
c) download also latest Android 4.4.3 (mirrors Google Drive) for Sony XPERIA T2 Ultra
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA Flashtool
e) open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
g) after few minutes all is done and your phone gets the new firmware
g) after few minutes all is done and your phone gets the new firmware
4. how to install the newest Android 4.3 for Sony XPERIA T2 Ultra D5303
a) first of all, check your firmware version (if you already have the newest one, you do not need this tutorial)
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA Flashtool
e) open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
g) after few minutes all is done and your phone gets the new firmware
g) after few minutes all is done and your phone gets the new firmware
5. root Sony XPERIA T2 Ultra with locked bootloader (and than install the newest Android and recovery)
a) before you start to do anything, backup all your user data and media files, because you will lost it and charge your phoneb) download and install latest Flashtool from this article
c) download this FTF file and flash it with Flashtool to you smartphone (it is important to Wipe data or your phone will not boot)
d) start your smartphone and enable developer options and usb debugging, also enable mock location
e) in security settings, enable unknown source
f) download this root package and unzip it in your computer and move it to Flashtool/X10flasher lib folder
g) connect your smartphone to your computer and go to Flashtool folder, X10flasher lib
h) hold shift button and right click with mouse, open command line and type adb devices
i) allow usb debugging on display your phone (steps g-h are not important, but it is better to check it)
j) if result is some kind of number, close command line and run install.bat inside root package from step f)
k) wait after root procedure is done, sometimes it is need to run it more than once (wait until you see SuperSU in your phone).
If this don't work for you, download this APK, run it in smartphone, install SuperSU from Google Play and than reboot your phone
l) download recovery for your phone from this site (select XZDualrecovery, than latest version and than Z2 installer)
m) unzip this file, connect your smartphone to computer and run installation, choose first option and than allow SuperSU
n) after some time you will get new icon in your phone, now you have recovery and root (but with old firmware)
o) now you need to flash prerooted zip file thru recovery mode and there are two options (steps p or q)
p) download it from internet, you can try to find it here or Google XPERIA T2 Ultra (firmware you want number) prerooted zip
q) make it by yourself, it is very easy and fast, i will show it to you here
r) after you have this prerooted zip file, push it to your smartphone
s) start recovery mode (from NDRUtils application in your phone) reboot to primary recovery
t) install your prerooted zip file (install ZIP and navigate to your file), than Wipe Cache and Dalvik Cache and power off your phone
u) sometimes this can be enough, but i really recommended last steps, it is better for your phone
v) download corresponding firmware (same version as is your prerooted zip file), you can also make FTF yourself with this video
w) flash this FTF file with Flashtool once more, but exlude system and partition
x) after it finished, turn on your smartphone
y) you are on firmware version you chose with root and recovery mode and with locked bootloader
z) when Sony Mobile company release new firmware, you can repeat this tutorial from step o), just change prerooted zip and than FTF
And that is really all for now. If this tutorial help you, you can donate to me thru PayPal
c) download this FTF file and flash it with Flashtool to you smartphone (it is important to Wipe data or your phone will not boot)
d) start your smartphone and enable developer options and usb debugging, also enable mock location
e) in security settings, enable unknown source
f) download this root package and unzip it in your computer and move it to Flashtool/X10flasher lib folder
g) connect your smartphone to your computer and go to Flashtool folder, X10flasher lib
h) hold shift button and right click with mouse, open command line and type adb devices
i) allow usb debugging on display your phone (steps g-h are not important, but it is better to check it)
j) if result is some kind of number, close command line and run install.bat inside root package from step f)
k) wait after root procedure is done, sometimes it is need to run it more than once (wait until you see SuperSU in your phone).
If this don't work for you, download this APK, run it in smartphone, install SuperSU from Google Play and than reboot your phone
l) download recovery for your phone from this site (select XZDualrecovery, than latest version and than Z2 installer)
m) unzip this file, connect your smartphone to computer and run installation, choose first option and than allow SuperSU
n) after some time you will get new icon in your phone, now you have recovery and root (but with old firmware)
o) now you need to flash prerooted zip file thru recovery mode and there are two options (steps p or q)
p) download it from internet, you can try to find it here or Google XPERIA T2 Ultra (firmware you want number) prerooted zip
q) make it by yourself, it is very easy and fast, i will show it to you here
r) after you have this prerooted zip file, push it to your smartphone
s) start recovery mode (from NDRUtils application in your phone) reboot to primary recovery
t) install your prerooted zip file (install ZIP and navigate to your file), than Wipe Cache and Dalvik Cache and power off your phone
u) sometimes this can be enough, but i really recommended last steps, it is better for your phone
v) download corresponding firmware (same version as is your prerooted zip file), you can also make FTF yourself with this video
w) flash this FTF file with Flashtool once more, but exlude system and partition
x) after it finished, turn on your smartphone
y) you are on firmware version you chose with root and recovery mode and with locked bootloader
z) when Sony Mobile company release new firmware, you can repeat this tutorial from step o), just change prerooted zip and than FTF
And that is really all for now. If this tutorial help you, you can donate to me thru PayPal
6. how to backup your original firmware customization
a) if you do not want to lose warranty of your phone, first thing you have to do is to backup your original customization
b) download Sony PC Companion and connect your phonec) select update your phone in Sony PC Companion
d) application will prompt you to disconnect your phone before starting downloading firmware, just make it (remember - dont disconnect your phone when update just start...)
e) after finish downloading firmware cancel the update
F) after that, go to C:\ProgramData\Sony Mobile\Update Engine\db\some number\blob_fs, there you find 3 (maybe 4) files, which names start FILE
g) download and install latest Flashtool from this articleh) paste the three files, which names start FILE, from blob_fs folder to folder „Firmware“ included in the XPERIA Flashtooli) open the Flashtool, click on Advanced, choose decrypt files and put all three files from blob_fs folder to the right colummj) click ok and after approx. one minute a pop up Window will appear via Flashtool
k) mark all files except simlock.ta and transfer them to the right column, than fill in a box in the right upper corner (fill in what you want, it is just for you)
l) now click ok and Flashtool will create backup of your original firmware customization, that you can anytime flash to your phone
b) download Sony PC Companion and connect your phonec) select update your phone in Sony PC Companion
d) application will prompt you to disconnect your phone before starting downloading firmware, just make it (remember - dont disconnect your phone when update just start...)
e) after finish downloading firmware cancel the update
F) after that, go to C:\ProgramData\Sony Mobile\Update Engine\db\some number\blob_fs, there you find 3 (maybe 4) files, which names start FILE
g) download and install latest Flashtool from this articleh) paste the three files, which names start FILE, from blob_fs folder to folder „Firmware“ included in the XPERIA Flashtooli) open the Flashtool, click on Advanced, choose decrypt files and put all three files from blob_fs folder to the right colummj) click ok and after approx. one minute a pop up Window will appear via Flashtool
k) mark all files except simlock.ta and transfer them to the right column, than fill in a box in the right upper corner (fill in what you want, it is just for you)
l) now click ok and Flashtool will create backup of your original firmware customization, that you can anytime flash to your phone
b) start Flashtool and click on BLU button on the top
c) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
d) click on get unlock key button, it will switch you to Sony Mobile website, here select your phone and hit continue
e) fill your email adress and accept terms and conditions, than click submit
f) go to your mailbox and click on Click here to proceeed link in mail from Sony Mobile
g) copy IMEI from Flashtool to Sony Mobile site and once more accept term and contidion, than click submit
h) copy unlock key to Flashtool window and than click unlocki) connect phone with holding volume up button when Flashtool shows pop up window
d) click on get unlock key button, it will switch you to Sony Mobile website, here select your phone and hit continue
e) fill your email adress and accept terms and conditions, than click submit
f) go to your mailbox and click on Click here to proceeed link in mail from Sony Mobile
g) copy IMEI from Flashtool to Sony Mobile site and once more accept term and contidion, than click submit
h) copy unlock key to Flashtool window and than click unlocki) connect phone with holding volume up button when Flashtool shows pop up window
j) wait to unlock finish
8. how to relock your bootloader
a) download and install latest Flashtool from this article
b) start Flashtool and click on BLU button on the top
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