[Q] Return to 2.3.3 or 2.3.4 from CM7.1

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SE Xperia Neo
I need help back to version 2.3.3 or 2.3.4 of the SE official ROM, I have installed theCyanogenMod7.1 (2.3.7).
Extra information:
I've never installed the 2.3.4
-The install 2.3.3 from the fact WotanServer a German version.
-I have the unlocked bootloader, when I start I get the logo the FreeXperiaProject and I can access the ClockRecovery Mode
-Have the problem that the battery is at 0% if lower version?

I do not speak much English so here I leave the text in Spanish:

SE Xperia Neo
Necesito ayuda quiero volver a la version 2.3.3 o la 2.3.4 de la ROM oficial de SE, tengo instalado el CyanogenMod7.1 (2.3.7).
Informacion extra:
-Nunca he instalado la 2.3.4
-La instalacion del 2.3.3 la hecho desde el WotanServer con una version Alemana.
-Tengo el bootloader desbloqueado, cuando inicio me sale el logo the FreeXperiaProject y puedo acceder a la Clockrecovery Mode

You will only get the 0% battery problem if you flash from 2.3.4 to 2.3.3 or 2.3.2, so no need to worry about this for you.