[Sony Xperia T, TL, TX, V] SdtBarbarossa:
[MENTION=5122093]WhiteNeo[/MENTION] its working :D thanky you VERRRRRRRRRRRRRRRRY MUCH ^^

to all:

If you have a BIG SDCard you can now boot from SDCard to have more space on /system and /data without any risk for your device!!!

here is how you do it:

1. Download [MENTION=5122093]WhiteNeo[/MENTION] ´s special boot.img https://mega.nz/#!SE5SXabK!ugk9uZ0Ak_yyVPbINPgUJiP6i8pSn-UypAOKrnL5cc8

2. Download CM12.1 latest version from Neo (10.10.2015)

3. Download suitable gapps (see op)

4. repartition your EXTERNAL SDCARD on pc (i prefer Ubuntu)

Make The following layout:

Partition 1 => System

Partition 2 => Data

Partition 3 => External_SD

make them all 3 in ext4 for now

5. Rename the boot-new2.img to boot.img

6. pack the boot.img into the cm12.1.zip (and replace the old)

7. transfer the cm12.1.zip to your INTERNAL sdcard on phone (the external will not work atm you know?)

8. flash the boot.img via fastboot

fastbot flash boot C:/boot.img

( replace C:/boot.img with the path to your boot.img)

9. boot to recovery

10. go to wipes -> advanced wipe .... and change the FS of /system and /data to F2FS

(only if you want) wipe cache

11. flash the Cm12.1.zip (the one you made)

12. flash gapps

13. flash su

14. reboot to system

HOW LONG the reboot takes DEPENDS on the used SDCARD!!!!

WARNING!!!

there is a Known bug that atm /external_sdcard cant be mounted (the 3rd partition on your external sdcard) i will pm [MENTION=5122093]WhiteNeo[/MENTION] to clear why its that (i guess fstab) i guess there will be a new boot.img that can be flashed via fastboot to fix that

How to create the 3 partitions you need on external sdcard (with windows)

tutorial [MENTION=5449956]Flashing_Expert[/MENTION] (i changed it to our needs)

Before anything backup all your data from microsd on your PC!!

You will need some microsd reader into usb

on windows you'll need minitool partition wizard for partitioning

http://www.partitionwizard.com/free-partition-manager.html

*

- Now just open Minitool

- Minitool will show you all your harddrives and usb drives including microsd

so be really carefull with what harddrive you working on (you can check it by capacity)

- first you need to delete actual partition on microsd

click with right button on your microsd, select delete and then on Apply button (this step erase partition and all data!! no way back after this)

- let say you have 32Gb microsd and you want create 3Gb partition for System and 10GB for data

- click again with right button on microsd (should be now marked as unallocated)

- and select "Create" window will popup

- in "Create as" select Primary

- File system = ext4

- Cluster size you can leave on default or select manually 32Kb cluster size

- Unallocated space before = 0

- Partition size = 3072Mb (if you want 3gb system)

- Unallocated space after < this will be free space for next partitions

- Partition Align to = MB

- Click on OK and click on apply

- congrats your System partition should be now created

*

- now click with right mouse button on unallocated space on your microsd and again select "Create"

- do the same as above but now with as much MB as you want for data ( e.g. 10240MB = 10 GB )

- do the same with the rest to create your external_sdcard partition

- your work on PC is done Partitions created so you can put it into phone