i had 2.3.7 installed a few days back.den i wanted to install 2.3.4 over 2.3.7 since i dint kno how to downgrade it. sonce my stock kernel crashed.and had to reflash.i wanted to downgrade it because after using 2.3.7 and den 2.3.4 i wud get better performance and stability. now my phone is reflashed.do i again hav to install 2.3.7 den use it for a while den downgrade to 2.3.4? or i can just directly downgrade it?