How to unroot and go back to default rom - XPERIA X10 Android Development

Hey,
i'm trying to unroot my phone and return to the stock rom that came with my phone, but I can't seem to find any way to do it.
When I try to use SEUS to repair, there is no repair option on the phone. All it says is that I'm using the latest version and there are no available updates.
When trying to use PC Companion to repair it keeps giving me errors about not being able to contact the server and to try again later.
I'm starting to pull my hair out over this, does anyone have any ideas?
Thanks.

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http://forum.xda-developers.com/showthread.php?t=683793

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Awesome! Thanks for the help.

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harder better faster stronger
easier way than all of that
insert the following code into ur keypad
*2767*3855#
Think before you use this code. This code is used for factory format. It’ll remove all files and settings including the internal memory storage. It’ll also reinstall the phone firmware.
PS: Once you use this code, there is no way to cancel the operation unless you remove the battery from the phone. So think twice before using this code.

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exekias said:
easier way than all of that
insert the following code into ur keypad
*2767*3855#
Think before you use this code. This code is used for factory format. It’ll remove all files and settings including the internal memory storage. It’ll also reinstall the phone firmware.
PS: Once you use this code, there is no way to cancel the operation unless you remove the battery from the phone. So think twice before using this code.
Click to expand...
Click to collapse
So this wouldnt mess anything up

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vrs2610 said:
So this wouldnt mess anything up
Click to expand...
Click to collapse
it does exactly wat the description says itl do, your ROM is always saved a small part of the phone for reinstallation, so its a fresh wipe and reinstall without using seus, itl remove root and anything on the phone but anything on the sd card will b fine

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exekias said:
easier way than all of that
insert the following code into ur keypad
*2767*3855#
Think before you use this code. This code is used for factory format. It’ll remove all files and settings including the internal memory storage. It’ll also reinstall the phone firmware.
PS: Once you use this code, there is no way to cancel the operation unless you remove the battery from the phone. So think twice before using this code.
Click to expand...
Click to collapse
I tried the above code but it says "Connection problem or invalid MMI code".