Here is the final version of Flashtool, compatible with Z/ZL To clarify about bootloader unlock/relock: Q: Can Flashtool unlock bootloader for a first time unlock? A: Yes, it does it using official sony method (get key, then issue the right fastboot command) Q: Can Flashtool relock bootloader? A: Yes Q: Can Flashtool unlock bootloader after a relock? With this release, before unlocking first time, root your device and you will be able to backup your TA partition (Raw ta backup). By doing this, you will be able to relock / restore your TA partition and have back BE2 and all DRM keys.
Sony Xperia Flashtool allows you to flash files onto S1 devices which range from Sony Xperia X10 to Z Ultra. The most popular usage of this flashtool is to flash FTF (Flash Tool Firmwares) onto compatible devices that you download using XperiFirm. Situations where you might find this tool handy.
Happy flashing Flashtool can be downloaded from For those having issues downloading, you can try this link.
Here’s what you need to download the official Sony Xperia Z5 E6653 stock ROM (firmware) flash file onto your computer. You can then use one of the compatible flashing tools to update the firmware on your smartphone or tablet. Flashing tools were initially developed by the companies that were associated with the device’s hardware and were mainly kept in-house, used in the back rooms of smartphone repair centers to fix common mobile device-related problems.
The tools were later leaked on the Web for anyone to use. Now you can solve the same kinds of issues that were once left up to those repair centers: bootloops, soft-brick situations, software errors, software bugs, update errors, so forth, by downloading the software onto your computer at home instead. What’s more, installing the Sony Xperia Z5 E6653 flash file is an easy task, thanks to the flashing tool’s user-friendly interfaces that usually require just one click before the flashing is underway. 
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Most third-party developers who create tools for helping you customize your devices—the teams that work on custom recovery images, rooting applications, et cetera—recommend sticking with custom software if you’ve already changed the system partition or already replaced the stock recovery partition with a custom one. If you are to go back to stock Android on the device, though, they recommend flashing the firmware yourself instead of accepting the over-the-air updates. This is because OTAs can create unexpected behavior since they’re often only patching over existing software instead of completely replacing it. The flashing tools such as the Sony Mobile Flasher tool are always computer applications.
On most occasions, these apps are relatively small files and won’t take up much hard drive space. You can sometimes have a choice of what flashing tool you want to use to flash the Sony Xperia Z5 E6653 firmware file.
You can flash Stock ROMs with tools that work for either the system chip found in the device’s hardware, the firmware file type, or on occasion, apps that are designed to work for a particular manufacturer. Download Sony Xperia Z5 E6653 Stock ROM (Firmware) • How to Flash Sony Xperia Z5 E6653 Stock ROM Using Sony Mobile Flasher 1. Download the and install it onto your computer. Download the application that is made to work with your operating system brand in mind—i.e., grab the version for Windows if your computer is running Windows. Follow the setup wizard until you have successfully installed the Sony Mobile Flasher tool on the computer. Open it up and look for the “Flash” button. Browse the computer for the firmware file that you have downloaded and extracted and then upload it to this location, making sure you have selected the actual firmware file and not just its folder.
Click on the “Flash” button. Start with the Sony mobile device turned off, and then connect it to the computer with its USB cable while holding the “Volume Down” button. The flashing should now begin automatically. For a more detailed guide with screenshots, you can check out the article. Important Notes [*] Back Up Your Data: You should always back up your data before you begin flashing new firmware files to your smartphone or tablet. All of your pictures, music, videos, documents, etc. Should be still on your device after you have updated the firmware, but you may need to restore the contacts and applications from a backup.