Help Please help to Upgrade at&t SE xperia X10 with 1.6?

[gana]

Hello everyone. i am really sorry for opening a new thread about this situation. Because i couldn't find any thread about it.

So I have a sony ericsson xperia X10 with 1.6 firmware from at&t and i unlocked it's working fine now.But i want to upgrade to a newer version and also want to root it and my question is if i upgrade my SE for anyway is it going to locked again or is there any problem for upgrading a those kind of phones? if it is not How to upgrade my at&t phone and how to root it?

Please answer my question ASAP because i am using very amazing phone with very old version also i can't install any non-market application.
Thank you

 

[KTP]

the simplest way i can think of is by using this thread:
xda-developers - View Single Post - [TOOL] [NEW 01/02/2011] Flashtool version 0.2.6

if you download the flashtool and then you can flash one of the versions of 2.1 to your phone.
its very easy to do so just read the instructions properly.

a quick guide to the intructions would be this:
1. download and install flashtool
2. download 2.1 firmware from the thread (this one is probably the one for you Generic version 2.1update1 build 2.1.A.0.435 )
3. place firmware file into the firmware folder of your flashtool
4. switch off your phone, pull the battery out, put it back in. (dont switch the phone back on)
5. run the flashtool on your computer, it will then tell you to connect your phone
6. plug the usb cable into your computer then while holding the back key of your phone plug the usb into it, your led should light up green, this is it in flash mode
7. follow instructions of the flashtool, it will do the rest.

but my instructions are quickly written so make sure you read the other thread properly, if you have any further questions i will be happy to help out.

 

[Merolas]

Yup as said many times before AT&T locks up the phone to a almost unusable brick...no carrier's 2.1 update, no non-market apps...This tool will do everything you want in one place, upgrade and root.

 

[gana]

Thank you guys.And one thing i asked before.is it lock my phone again?I paid 50 bucks for unlock it and i don't wanna pay again.
Thank you again

 

[Merolas]

It wont since it will be on a generic rom

 

[gana]

thanks all.I flashed and rooted my xperia. It works like a charm. I am very happy to get rid from at&t stuffs.
Thank you

 

[badriceb]

Thank you all...I flashed and rooted my xperia....got rid off the at&t stuffs....