questions about unlocking

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http://forum.xda-developers.com – Hi, I have my Desire S totally with the stock system. So S-On, bootloader locked and oficial rom 2.3.5 branded from Vodafone Spain. Finally I decided to unlock my desire S and to change the rom, etc. After reading a lot, the following are the steps i want to do for that. Before all I would like to back up my apps, sms etc, contacts are in google so i dont worry about them.. ¿How could I do it with my stock desire S? Once i have the back up I will perform these steps: 1.- First to downgrade de Hboot ( mine is 2.00.0002 locked) following this guide: http://forum.xda-developers.com/show. (HowTos)