How to Update Sony Xperia Z4 to Android 5.1 Lollipop via latest Custom ROM Sony gives access to Android 5.2 Lollipop update for the Xperia Z4 users. The update hasn’t released globally yet though; so the users have to keep waiting for the update to hit on their devices. Update Sony Xperia Z4 to Android 5.1 Lollipop via latest Custom ROM Thanks to recognized XDA developers who’ve come up with yet another much needed update. Follow the steps written below carefully to receive the Android 5.1 Lollipop update on your Sony Xperia Z2 device. Pre-requisites: The following guidelines are made for the Xperia Z4 only. Make sure that your device has at least 80% battery backup while doing this process. Enable a proper custom recovery tool like CWM or TWRP on your device. Install required USB drivers on your PC and USB Debugging Mode on your Smartphone. Steps to Update Sony Xperia Z4 to Android 5.1 Lollipop via latest Custom ROM: Step 1: You can begin with downloading the Android 5.1 Lollipop AOSP Beta ROM for your device on the PC. Step 2: Now, download the Gapps files. Step 3: With the help of a USB cord, connect your device with PC. You can transfer the above downloaded files to the internal storage of your device now. Ensure that you’ve transferred it to the rooted folder. Step 4: Remove your device from the PC. Go to the Fastboot folder along with boot.img and system.img files. You must have Android ADB tools on your PC. Step 5: In the download mode, turn off your device. Press and hold Volume button together for doing this. Step 6: You can go further with the flashing of boot.img and system.img files available in the fastboot folder. Step 7: Go back to the recovery mode. Choose ‘wipe data factory reset’. Now, select the ‘advanced’ and wipe data, dalvik cache, and other caches. Step 8: Click on ‘install zip from SD card’. Follow the above steps for Gapps files as well. Flash all the files. Step 9: Select ‘reboot system now’ so that you can proceed with the rebooting process. Now, you can start enjoying the brand new features of Android 5.2 Lollipop custom ROM on your Sony Xperia Z4.