Default Alcatel OT-991 ROOT (denver)

Hey everyone. I'm sorry if there are other topics about alcatel ot-991,but I have a different model and I couldn't find something that can help me.
I own an Alcatel One Touch 991 Orange Denver. I found many threats about rooting an Alcatel OT-991,but i get stuck at one point.
Have anyone rooted this device?
I'm afraid of losing it.I don't wanna lose it..
I wanna root it because of the low internal memory.
I hope that someone have the answer to my question.
*sorry for my english,i'm from Romania*
I will add some pictures,to see the model. If you want extra pictures,tell me.
First picture it's from google,second one is mine.
EDIT:
Is there any difference between 991 and 991d?
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