Default HELP badly request stuck on boot android logo

Hello

I have an Allwinner tablet, chinesse stuff i think..after instaled from market an app for fonts, the tablet restart and it stuck on android boot logo .
I try all the tricks possibile , factory reset /clear cache partition, useless... i cant go back to my default instaled rom.
The problem is i cant find JB 4.2.2 for my model tablet to flash a new rom
Need help pls, it s any solution to fix it ????
I thinking to instal CMW , but i dont no if is ok ,and after that to install a JB3.2.2 variant ????
Pls help, im stuck here ..