[Xperia Z1 Compact General] SXUsr:
UPDATE: 03/10/15

Most of the "how to" stuff in this thread is still relevant which is why I'll leave it in for reference, but to update and root (with UL BL) the latest version simply...

Download and install the latest Flashtool

Run XperiFirm (comes pre-bundled with the Flashtool) to download the latest FW.

Download [UB ONLY] [kernel] Root, init.d support, Recovery & Busybox for 14.6.A.0.368

For a locked bootloader you'll need to read a thread like [D5503][Stock][PRF+FTF][Lollipop]14.6.A.0.368_CustomizedIN_Pre-Rooted with recovery

I'll be moving to the Z5 Compact in the coming weeks so this will be one of the last posts I make here in this section.

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NOTE:

WAIT for the Flashtool to prompt you when to enter flashmode otherwise your Phone will simply reboot.

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NOTE:

If you have UNLOCKED your bootloader then trying to update OTA will fail and you will need to use the Flashtool to update.

To De-brand your Phone you need to flash a Stock/UnBranded/Generic .ftf.

The ONLY way to Sim Unlock your Phone is by PAYING for an Unlock Code from your Carrier/Network Provider or a Third Party source, flashing Firmware will not change that. O2 however does UNLOCK for FREE if you're a Pay Monthly customer.

Service Menu - *#*#7378423#*#*

To Update with Root check the Root Section below.

Official Tools:

Sony Update Service (SUS)

Sony Flash tool for Unlocked Xperia™ devices

XDA Tools:

Flashtool

[Drivers] FlashTool Xperia Driver Pack

[REPAIR HARD BRICK] Test Point For Xperia Z1 Compact

[GUIDE] Recover 2012 and newer XPERIAs from SOFT-brick

How To Guides:

[TUTORIAL] HOW TO FLASH STOCK ROMs WITH FLASHTOOL

[GUIDE] Download ANY firmware customization from Sony & create an FTF with Flashtool

[YOUTUBE]j8EQmufr0lw[/YOUTUBE] [YOUTUBE]bB77gWRUI_A[/YOUTUBE]​

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If you need an older firmware then a search of the forum or Google will help with that.

[TOOL] XperiFirm ~ Xperia Firmware Downloader & Checker

[TOOL] Updatechecker Xperia Devices

[TOOL] Website for instant firmware update check for Xperia phones

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NOTE:

If you got your Phone from a carrier then the chances are you wont be able to unlock your bootloader and at the time of writing this there is no easy work around. So if you plan on using custom ROMS like CM then you need to get a SIM Free/Un Branded Phone. In the UK it's reported that the Carphone Warehouse provides all their Phones SIM Free even if you get a contract but you would have to check yourself.

You can check your Phones unlock status in the Service Menu - #*#7378423#*#/Service Info/Configuration

[YOUTUBE]PvUIu5EG3ng[/YOUTUBE] [YOUTUBE]Vs2iPY0J4ZA[/YOUTUBE]​

[TOOL][LB][ROOT] Backup TA v9.11 for Windows

Backup TA for Sony Xperia™ (Mac OS X version)

[Tutorial] Xperia Z1 Bootloader Unlocking/Relocking (The Z1 Compact uses the same method)

[GUIDE] Back up DRM Keys & unlock Bootloader (Noob proof)

CWM Recovery:

TWRP 3.0.2 for amami **UNLOCKED BOOTLOADER**

nut.xperia-files.com

[DEVDB][TWRP][PhilZ Touch][CWM] XZDualRecovery 2.7.1XX RC *** For Locked and Unlocked BOOTLOADERS! ***

[D550X] CWM-Based Recovery 6.0.4.6 + ROOT for Xperia Z1 Compact {KitKat!} **UNLOCKED BOOTLOADER**

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NOTE:

Rooting is much easier if you have an Unlocked Bootloader because then it's as simple as flashing a Pre-Rooted ROM, or the latest .ftf with a Kernel with CWM (above) and the latest SU.zip (below).

[YOUTUBE]l78p_2ShPS0[/YOUTUBE]​

Timeline of the video:

00:10 What does rooting mean?

00:39 Will rooting void my warranty?

01:07 Can I flash custom ROMs after rooting?

01:46 How to unlock the bootloader? (http://unlockbootloader.sonymobile.com/)

02:22 In configuration my phone says: bootloader unlock allowed: NO is there a way around?

02:47 Will you loose warranty by unlocking the bootloader?

02:54 Will I loose X-Reality engine and is there a possibility to bootloader lock my device? (TA partition backup: http://xdaforums.com/showthread.php?t=2292598 ) video

03:24 SIMLOCK after rooting

03:45 FTF file format what is it?

04:04 What is flashtool? (http://www.flashtool.net/download.html)

04:26 How to connect device in flashmode?

04:37 How to connect device in fastboot mode?

04:46 Do I need to be rooted to use flashtool?

05:12 My device is not recognized in Flashtool?

Latest Method:

Easy Root Tool for various Xperia devices

CF-Root

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[DEV]cracking s1 bootloader

Open source archive for build 14.2.A.1.114

Open source archive for build 14.3.A.0.681

Open source archive for build 14.3.A.0.757

[Tutorial] Programming for Sony Products [Xperia SmallApp][SourceCode]

[GUIDE][HOW-TO]Extracting A 'boot.img' From An FTF

[Tutorial] Kernel building instructions for Xperia devices

[boot script for locked and unlocked] chargemon for recovery boot

[Easy Tool] for devs and rom cookers

[TOOL] PRFCreator - easily create pre-rooted firmwares

[TUTORIAL] How to integrate recovery into your custom rom

[GUIDE]How to make a rooted flashable rom from ftf file[FOR ALL XPERIA PHONES]

[DEV + HOWTO] KangXperiaProject - AOKP for Xperia (tutorial to compile from source)

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Removed the ASF (pictures inside)

Check your Z1c's display manufacturer

[DIY][Tutorial] Get rid of the Led bleed on your photos !

Z1C plastic back replace with a glass one(with pic)(fix flash bleed)

[Tutorial]What Are The Exactly Permissions To Replace Apps

[TUTORIAL] [UPDATE :- 01.02.2014] Customization for Xperia Home JB 4.1/ 4.2/ 4.3

[GUIDE][CAM] How To Hack SONY Xperia Camera (Bring Higher Bitrate & More Options)

[4.4] True Quick Settings

[MOD][KK/JB] Radio Without Headset (Turn on FM radio without headset plugged in)

Make 5 Button Navigation Bar Android

[Mod] Dark Apps - Modded styles.xml...

[MOD][AROMA][Z1C][4.4.4][.157] Dark System Apps v3

[Tutorial]Howto Add Cpu Control & Stats in Settings.apk !

[GUIDE][HOW-TO]Add Invisible Power Button to Status Bar

[Tutorial] Adding new Activity Header/Sub Menu to Settings.apk

Comprehensive Guide for Beginners to Create 4.3 Xperia Themes

[MOD][GUIDE]SUPERUSER MOD for all devices

[FIX][ROOT] Disable Fast dormancy on sony smarthphones

[TOOL] Kamome tool for Windows - deodex tool for 4.4 KitKat

[Patch] for Z1 stock based custom ROMs to work on Z1 Compact

[INDEX] Index of Apps/ Tools/ Themes /etc in the SONY Cross Device Development Thread

[YOUTUBE]1CRz5F0g-mg[/YOUTUBE] [YOUTUBE]_G6aSZgKUfI[/YOUTUBE]​

Set up Remote Shares