Is there a way I can downgrade my Android version from 2.3.6 to 2.3.4 on Alcatel OT-991D?
I believe not. The official website does not include ways to downgrade your software for various reasons, one of them is the possibility to brick the device. There are no official ways to do that but if you feel the need to take a challenge, you can use http://forums.xda-developers.com to search for alternative ways related to this query.
