How to Factory Reset MID9042?

OK, I rooted my MID9042 by using this thread :
READ FIRST: Development Index and Root Utility
Now there is a Superuser icon in the apps menu!
Then I dumped these files : boot.img, bootloader.img, recovery.img, and system.tgz

Edit 1 :
I installed this file from sdcard by using Android system recovery <3e> :
9042_recovery_signed
This time when I push and hold Power and + , instead of "Android system recovery <3e>" I have "CWM-based Recovery v6.0.2.8 9042 by Vampirefo"
 
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You know, I already used LiveSuit to install an img
So these files are not the original firmware dump of MID9042
Than again I can upload them if they are really useful
 
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