Possible solution for Fastboot-Windows7 Problems
Hi guys, I have found a workaround for those having trouble with installing drivers for fastboot in Windows7. This process requires you to do things in the right order and to be quite fast during some steps, so it may take a couple of goes to understand what you are doing before you nail it. First let me explain what seems to be the problem, to help you understand the method I about about to share with you:
It seems that if the drivers aren't installed in Windows7, the Xperia S will disconnect from fastboot mode, and go back to charging. What we need to do is install drivers in this small time period it does connect to your computer.
The solution to this problem will involve being quick at two stages of this process and I will note where these times are as best I can.
Both these stages are when we connect the phone to the computer in Fastboot mode.
Steps to install drivers:
1. Open device manager
2. Connect you phone in fastboot as normal
3. As soon as you plug your device in, ignore any messages stating the driver did not install and look in device manager for the new device 'S1Boot Fastboot' . Right click this and click 'update driver'. This is the first stage you need to be quick at. As soon as you click this and the update driver window pops up you can relax! You can let go of the volume up button now also, as the device will disconnect in the background anyway! You can also unplug the phone now too.
[NOTE: If windows is still trying to install this device, you won't see update driver until it stops/fails. This is when you have a few seconds to click update driver, so be quick!]
4. Click 'Browse my computer for driver software'
5. Click 'Let me pick from a list of device drivers on my computer'
6. Click next with 'Show All Devices' highlighted
7. Click 'Have disk'
8. Click 'Browse'
9. Go to the the .inf file and open it
10. Click 'ok'
11. You will now have a list of three models. Select 'Android Bootloader Interface'. (It is easy to miss this step out and accidently choose the default model so make sure to select it correctly!)
12. BEFORE you click next, we need to get the phone connection ready again, this is the second stage where quick actions are required.
Disconnect you phone if you already haven't. Connect the phone once more in Fastboot mode. As soon as it is connected click next on the window to install drivers
13. If you followed this right you will have installed drivers before the phone had time to disconnet
14. Now that the drivers are installed for the Xperia S, it will no longer disconnect from fastboot mode and work as it should!
Now contiune to follow Sony's guide
I hope this helps you fellow Xperia S users that have problems!