Thanks SK_007SK_OO7 posted a new thread with the stock Sony 2.1 2.0.2.A.0.24 rooted and with JIT. Unlike the previous method this is much easier and is all done with xRecovery.
1.It is based on the latest 2.0.2.A.0.24 Rom
(Firmware version 2.1-rooted-zdz)
(Baseband version 188.8.131.52)
(Kernel version 2.6.29
2.Off course it is rooted
3.it is latest JIT v2 enabled(previously it was JIT v1 enabled)now you can get a score of upto 35 Mflops in linpack
He posted 3 different methods of installation and recommends the last 2 since they work "all the time".
1.Copy the zip file[SK_007(Stock)Rom_final-JIT-v2.zip] to the root of your sd card,then reboot into xRecovery and click intall custom zip,then select SK_007(Stock)Rom_final-JIT-v2.zip ,it will start installing it,when finished reboot your device and Voila! its done,Enjoy.....
2.After downloading [SK_007(Stock)Rom_final-JIT-v2.zip] extract it,you will find a folder named "2010-12-184.108.40.206".Copy the following folder in xrecovery/backup folder in your sd card,after that reboot your X10 into xrecovery mod and restore "2010-12-220.127.116.11",and Voila.its done,Enjoy....
3.Go in xrecovery/backup folder(u can use root explorer or u can simply plug in your X10 to your pc with sd card mounted),there will be atleast one folder in it(if u have created a any backup(if not then first reboot into xrecovery and create a backup),replace all the 4 files,i.e cache,data,nandroid,system(img) with the 4 files u find in the extracted filer(2010-12-18.104.22.168),after that reboot your X10 in xrecovery and restore that folder,and yeah it will start restoring,enjoy.