Hello again ,
After some testing i can tell you the following , i used another sd without anyfiles and still gives me errors in installation but there is a way to install it if u just unmount the sd , no need to put it back as the previous firmware (error note enough space) i ve installed both angry birds and it worked like a charm

, i will try later to use apps2sd to move them cause as i said you before at settings the internal memory storage is limited to 800mb, but in the file explorer i see that i have 2.2gb , any ideas?
i must say that the scrolling is better and the touch screen behaves better after the update , so keep up the good work.