nuclear pub eng 4.04 IMM76D 20130426 rom needed

Hi,i got this A13 tablet from ebay, but the firmware is corrupt i think, it is slaggy, it freezes alot and apps close. I am looking for a mod or an image for it.

Here it is the info, it is

CPU:armv7 A13
Model number:SoftwinerEvb
Android version :4.0.4
Baseband verion:1.5
Kernel:3.0.8+ hzj@exdroid #40
Build number:nuclear pub eng 4.04 IMM76D 20130426

Thank you very much