i think thats the easiest way to root is that if you have rooted 562 then do the OTA (over the air) then you will keep root also

i finished the FTF for the Arc (lt15) and i'll upload it tomorrow!

Back up links for 4.0.4 and 4.0.3 Kernels [Only for Lt18i ARC S]

---

Originally Posted by OverLo4d

i didn't try that, you might loose your root.

First of all thanks a lot to Overlo4d for this trick. Now I have edited my post a little bit just to share how i did the root.

Please remember I have an Lt18i [ARC S]


* I flashed the 4.0.4 [0.431] firmware from here. = http://forum.xda-developers.com/show....php?t=1583010
* I flashed the kernel of 4.0.3 [0.562] firmware. AND Kernel Sources :- http://www.mediafire.com/?u4yyu9066gloxxu
* Then I rooted using the following script by DoomLord. AND Root Source:- http://forum.xda-developers.com/show....php?t=1601038
*Then I flash back the kernel of 4.0.4 [0.431] firmware. AND Kernel Sources:- http://www.mediafire.com/?qx8gi3imbgqlxh5

Originally Posted by auni

It works!

After Flashing 4.0.4 ftf, I flashed the 0.561 kernel for root. And after rooting i flashed back the original kernel of 0.431 again.

The root is still there.

great! i'll make a second ftf that will flash only the 431 kernel.

now available for the Arc!
please reply if it works well.

I have a locked bootloader and am new to android.
I've just upgraded from 2.3.4 to 4.0.4 via sony update service.
Please tell me how to root my device (Xperia Arc) using the file in the post.

Worked for me. I had a lot of errors after flashing the old kernel btw. But after rooting with the one click program I flashed back the new kernal.sin and loader.sin and now I don't get any errors anymore. I removed all bloatware and ads using root ^^

flash the file in the post, than download this:
http://uploaded.to/file/ia1eriso
extract this, open the adb, than open 'run me', thats it!

hit the thanks button if i helped you

Originally Posted by OverLo4d

flash the file in the post, than download this:
http://uploaded.to/file/ia1eriso
extract this, open the adb, than open 'run me', thats it!

hit the thanks button if i helped you

did u make the packege to flash the just the stock 4.0.4 arc kernal back because i ran into lots of problems leaving the 4.0.3 kernal on the arc every time i rooted 1 m8

Originally Posted by buzzinkeegs

did u make the packege to flash the just the stock 4.0.4 arc kernal back because i ran into lots of problems leaving the 4.0.3 kernal on the arc every time i rooted 1 m8

yes, but i can't upload it because i have a problem with the internet conection
now i'm tethering form my Arc s, so the upload speed is really bad
i will upload it as soon as i can