Arc/S LT15i/a -18i/a 2.3.4 build number 4.0.2.A.0.62 (pre-rooted version too)

[Uliwooly]

Xperia Arc LT15i/a & Arc S LT18i/a    2.3.4   build number  4.0.2.A.0.62

LT18i

HW Version	SW Version	Request Type	Date Certified
A	4.0.2.A.0.62	ECO	Dec 20, 2011
A	4.0.2.A.0.61	ECO	Dec 12, 2011
A	4.0.2.D.0.4	ECO	Dec 2, 2011
A	4.0.2.C.0.5	ECO	Nov 11, 2011

LT15i

HW Version	SW Version	Request Type	Date Certified
A	4.0.2.A.0.62	ECO	Dec 20, 2011
A	4.0.2.A.0.61	ECO	Dec 12, 2011
A	4.0.2.D.0.4	ECO	Dec 2, 2011
A	4.0.2.A.0.58	ECO	Oct 21, 2011
A	4.0.2.A.0.42	ECO	Oct 7, 2011
A	4.0.1.C.0.86	ECO	Oct 4, 2011
A	4.0.1.A.0.283	ECO	Sep 16, 2011

[Uliwooly]

yes flashtool won't affect your bootloader at all

This is how to root the latest firmware w/o unlocking your bootloader

http://talk.sonyericsson.com/message/142493#142493

[#3]

Can that also be done on a SE Xperia Arc?

[Uliwooly]

yes, you can get the Kernel from here

http://talk.sonyericsson.com/message/130711#130711

[Uliwooly]

http://forum.xda-developers.com/showthread.php?t=1541448