Viber never worked properly on almost all Noir series phones, except Noir A5 ( Actual One ) 650Mhz, that was the only phone on which Viber worked smoothly as well as GPS was faster than any other Noir Series phone.
Personally Myself I am using Noir A8 and had this issue of ( ROBOTIC VOICE) due to which I uninstalled Viber and I switched on to Alternate FreePP: Call & Message which worked fine, today on Sharing Is Caring Monis Khan shared the solution that Older version of Viber works fine on all Noir Series phones going through entire procedure on that website I download the APK file and uploaded on Box.net for you all, so you can download without any hassle.
Kindly Report the issue If any after this version’s installation, first uninstall the latest version than Install this APK and Go with the flow , That’s It .
For further Discussions join Sharing Is Caring Facebook Page where we all discuss and help out each other you can even join the INCPak Forum which Is Ready to Rumble !
Personally Tested checked Verified on Qmobile Noir A8 !