Unhappy Help With MMX Funbook Pro

Guys, i use Micromax Funbook Pro i have a problem, i rooted my tab and after a long time, been 1 year IDK how but the SU binary file got deleted and i can't restore it also cuz it's in the System folder and root is needed to access it and i can't re-root or un-root my tab also so can anybody tell me a solution to this problem and Aroma File manager can't be flashed, i want the signed version by SignAPK or recovery manager won't allow so please help me