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Flash mode and Fastboot mode for dummies

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HvdW
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(Last edited by HvdW; 28th March 2014 at 09:33 PM.) Reason: typo
#1  
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Thanks Meter 12
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Default Flash mode and Fastboot mode for dummies

I have been struggling around a lot with my Xperia T

One thing that struck my attention is that every howto on how to get into flash or fastboot mode states that you just push up or down and plug in the USB to get into Fastboot resp. Flash mode.

On my phone that does not work and never did.

How to get into Fastboot mode
- switch off phone
- push vol up
- plug in USB
- now push on/off too until phone vibrates
- release on/off button first and off you go into Fastboot (blue led)

How to get into Flash mode
- switch off phone
- push vol down
- plug in USB
- now push on/off too until phone vibrates
- release on/off button first and off you go into Flash mode (green led)

Hope with this I can save some people a lot of time searching how to get the damned thing into the good mood (mode)
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HvdW
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(Last edited by HvdW; 31st March 2014 at 09:50 PM.)
#2  
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Posts: 46
Join Date: Jan 2013
I want to add some information for people like me who don't have a steep learning curve.

What you need to obtain for yor Xperia T:
- Flashtool (very handy to flash a custom Sony Xperia Rom when you're stuck somewhere) http://www.flashtool.net/download.php
- minimal adb and fastboot to be able to flash a boot.img of your choice http://forum.xda-developers.com/show...php?p=42407269
- ftf files to flash to your phone with Flashtool http://xperiafirmware.com/8-firmware...-xperia-t-lt30
- a decent boot.img http://teamw.in/project/twrp2/143 (I prefer TWRP over CWM)
the files ar on http://techerrata.com/browse/twrp2/mint the page is a bit confusing. To get your hands on the desired file just tick on F5 to reload the page, it helps. I used openrecovery-twrp-2.7.0.1-LT30p.img

- A 4.3 ROM http://forum.xda-developers.com/show....php?t=2681208 or http://forum.xda-developers.com/show....php?t=2677235
Put the zip files on your micro sd card in the phone
I used LT30p_unsigned_031414_094356.zip and UPDATE-SuperSU-v1.89.zip


First: if anything goes realy wrong, don't blame me, it's your own risk.

Install Flashtool and Minimal ADB and Fastboot

-Practice a few times how to get your phone into fastboot and flash mode, so you don't have to panic in case everything goes wrong.
- Always start with a full battery.

Practice a little with adb and fastboot.
- go to the command prompt in Windows get your phone into fastboot mode and issue the command: 'fastboot devices'
There are plenty howtos on adb and fastboot, see for yourself

I suggest to start realy simple by flashing one of many ftf files to your phone.
Why? Flashing an ftf file is the easy recovery to restore your phone.

Download any ftf file (for Xperia T of course) and put it in c:\flashtool\firmwares directory
Start Flashtool, click on the flash on the left, choose a file and start flashing.
Don't adapt any settings, just flash straightforward.
Halfway in the proces Flashtool asks to put your phone into flashmode again; don't ask why, just do it.
After a few minutes you have flashed your first stock rom.

Next step is to install a 4.3 zip file you downloaded from XDA.
Put a TWRP image into the adb and fastboot directory of your computer.
(as I said, I prefer TWRP over CWM and it works, don't ask me how or why, it works)
Go to the command prompt in the adb and fastboot directory
Attach your phone in fastboot mode.
issue the command : fastboot devices to be shure you're connected.
Search your img file
type fastboot flash boot openrecovery-twrp-2.7.0.1-LT30p.img
If it doesn't work issue a ctrl-c, disconnect your phone, connect it again into fastboot mode, control the connection by asking fastboot devices and again issue the command: fastboot flash boot example-filename.img
It will work.
And when it works you'll end up with a rooted device.

As you have already put your zipfiles on the micro sd card you can go ahead right away.
TWRP is easy to use.
Again my phone refused to react properly in the first place, but I tried a few times, wiped everything I could wipe, in my case I even erased the internal SD card.
TWRP warned me not to reboot because there was no operating system present.
So I installed LT30p_unsigned_031414_094356.zip again and it worked.
After that install UPDATE-SuperSU-v1.89.zip

Reboot your phone and everything is set.

If afterwards you want to install TWRP again on your phone, just go to Google Play and install it.
It's easy as that.

And remember, if everything goes wrong, try to get into flash mode (you did practice how to do it, didn't you), flash an ftf file and your phone is restored.

Hein
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peter-k
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Thanks Meter 162
Posts: 789
Join Date: Jul 2013
Location: Singapore
I have done this a number of times, but after a few weeks I tend to forget the steps and what items are needed. Therefore, your write-up is very useful indeed.

Especially those advisory threads which include a number links to other threads for the subject which I want to learn about, these are really a bad habbit at XDA.
"I don't think we need comments/discussions on rules/guidelines."
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