This is the guide for SO-01F users to root and update for 4.2 14.1.H.1.281 If you are C69xx user, please exclude partition and ta when you flash docomo FTF. Requirements: Flashtool 0.9.14 by @Androxyde (Japanese translated version is here) ADB setup (Search how-to) Downloads: SO-01F_14.1.H.1.281_NTT docomo.ftf any C6903 14.1.G.1.534 generic ftf XZU & Z1 recovery v4 Windows rootkitXperia Flashtool cwm_prerooted_Z1.zip XZDualRecovery (Z1-lockeddualrecovery2.7.*-BETA.installer.zip) Instruction for .681 1. Enter into flashmode and flash 14.1.G.1.534 ftf Wipe: Check all Exclude: Check all but uncheck kernel and system !! This will format internal storage !! 2. Boot and enable USB debugging and Unknown source (Search how to enable if you don't know) 3. Run rootkitXperia 4. Run XZU & Z1 recovery v4 Windows 5. Copy cwm_prerooted_Z1.zip to Z1's storage 6. Reboot and enter into recovery by pressing volume up and install cwm_prerooted_Z1.zip 7. Power off after completed 8. Enter into flashmode and flash 14.1.H.1.281 ftf Wipe: Check all Exclude: Check all but uncheck kernel 9. Install XZDualRecovery 10. Done! Instruction for .119 Posted here How to create prerooted zip by yourself Requirements: 7-Zip Command Line Version cwm_prerooted_Z1.zip (template zip) FTF to update 1. Put 7za.exe, ftf and template zip in same folder 2. Open command window by Shift + Right click -> "Open Command Window Here" 3. Type and run one by one: Mã: 7za e (name).ftf system.sin 7za e (name).ftf kernel.sin This will extract two sin files from FTF. 4. Open Flashtool, then select tools -> Sin editor 5. Browse and select system.sin, then click "Extract data" 6. Browse and select kernel.sin, then click "Extract data" 7. In command window type and run: Mã: 7za a -tzip cwm_prerooted_Z1.zip system.ext4 7za a -tzip cwm_prerooted_Z1.zip kernel.elf 8. Done, you can now copy cwm_prerooted_Z1.zip to internal storage and install it with recovery. You have to flash rpm.sin with Flashtool after installation. Enter into flashmode and flash ftf Wipe: Don't check Exclude: Check all but uncheck kernel Nguồn: forum.xda-developers.com/