Hey! finally i found a method to root my phone and to delete the hated "first" google account.

1. download from xda developers UniversalAndroot 1.6.1
2. download the sqlite browser here
3. install universalandroot.apk on your mobile
4. run it and get the root access
5. select the debug from menu->settings->applications->development->usb debugging
6. plug in the phone on your pc and select the sync method with pc
7. download the SDK from google android site.
8. copy the zip content in c:\android
9. open cmd and go to c:\andorid\tools\
10. lunch adb.exe shell
11. you will see the $
12. write su
13. look on the screen of your phone. You will be asked to accept the root connection. just accept.
14. now in cmd you will see #
15. cd /data/data/com.android.providers.contacts/databases
16. cat contacts2.db > /sdcard/contacts2.db
17. open the db from your sdcard with sqlite browser and modify the _sync_ table removing the unwanted account row.
18. cd /data/data/com.google.android.providers.gmail
19. delete the unwanted Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript file
20. from /data/system/sync/accounts.xml delete all account rows you don't need more and modify the sequence id
21. from /data/system/accounts.db remove the row of unwanted account and save the file (as in 17th step)