mobile

hi friends, i really need help on htc sensation z710e i had it since 2011 runing venom ViperS_C2_5.2.0 Rom i took good care of it even after i bought an xperia Z1 and now i have an xperia z2 but i gave the htc sensation that i really protected to my niece of 6 years old she was playing sub surfs on it, it overheated a lot and runed out of juice she plugged the electric cable and left it in charge when she tried to turn it on it started rebooting every time on the end of the boot animation when i came back i tried flashing the rom again but it was stuck on 1% even with other roms and when i tried formatting it from the recovery (4EXT) it stuck again i cant format can't delet cach nothing even when i plug on the computer and use commands like erasing or flashing nothing works.

i'm not a pro i rooted the device by following articles on internet in 2011 and until last week this phone never had a problem it is very dear to me and i wish i can make it work again please help.