This is complete misinformation. Pls research before posting. There is an amazing product called Google Search, and its FREE!
USE IT!!
The ClockworkMod app has been known to be problematic for some months now especially for the E739 (and possibly other phones). This does not mean that CM9 is the cause of the problem. It is not.
There are some rather impressive CM9 nightlies available.
So if you want to try CM9 you have many options as there are a lot of mirrors spread across all of the internets.
My 2 favorites are to either download the ROM directly from
CyanogenMod Downloads, select the E739 on the LHS of the screen, or use GooManager from the Play Store and download the ROM that way.
The CM9 ROM from 05/31 is very nice. You WILL need Gapps.
If you use GooManager you can also get Gapps through the app.
It is important that you understand that a ICS ROM requires a different set of Gapps that a Gingerbread based ROM.
The recommended Gapps for CM9 is 20120429 available thru the GooManager app or from
Goo.im Downloads - Browsing gapps.
Of course before flashing any new ROM, always make a backup of your current ROM and never assume that a backup you have restored previously will work again.