VOL-4268: Update to 3.4.9.9 version of deb package

Change-Id: I32a06e3aaf5d56fa948827ab07ee9e0535c0a82f
diff --git a/deployment-configs/flex-ocp-cord-TT.yaml b/deployment-configs/flex-ocp-cord-TT.yaml
index 167b5ba..7c7da9e 100644
--- a/deployment-configs/flex-ocp-cord-TT.yaml
+++ b/deployment-configs/flex-ocp-cord-TT.yaml
@@ -50,7 +50,7 @@
     fortygig: 'true'
     aggPort: '1'
     serial: 'EC1838000853'
-    oltDebVersion: openolt_asfvolt16-3.4.8-eec0fc9e9a01dc0d35b0b8441e0a22a4c0cc51b4-40G-NNI.deb
+    oltDebVersion: openolt_asfvolt16-3.5.1-b8c09facd3da5d93b7c2815e176c6682de737437-40G-NNI.deb
     board_technology: XGS-PON
 
 onus: