If you’re into updating your Xperia Z Ultra’s software or fixing your bricked device, you’re going to need to learn first about how to boot your Xperia Z Ultra into Flash Mode.
Flash mode is similar to Download mode on Samsung Galaxy devices. You need to boot into Flash mode on Sony Xperia devices to change/update the Software version on device, and for the more seasoned users among us, Flash mode also lets you to flash custom kernels on your device using a third-party flashing utility called Flashtool.
Flash mode can be easily accessed on Xperia Z Ultra and other Sony Xperia devices. The method discussed below can be used for any Xperia device released since 2012, devices released before 2012 may have a different way of booting into Flash mode.
Xperia Z Ultra ULTRA FLASH MODE
- Switch off your Xperia Z Ultra first
- Press and hold the Volume Down button
- Connect to your PC using a USB Cable while holding down the Volume Down button on your Xperia Z Ultra
└ Before plugging in the USB cable on your Xperia Z Ultra make sure that the other end of USB cable is already connected to the PC. - Your Xperia Z Ultra should be in Flash Mode now and the device’s LED light should turn into Green
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