Glad to know you cook a new ROM for us.
Be advised, OTA 7.09.401.30 contains an incomplete stagefright patch.
Yet, OTA 7.21.707.35 specific for Asia has a full patch, as per here :
New OTA for TW version 4.30.709.12
Sorry for the typo it's 4.28.401.3
Can you please explain me how to install after downloading this rom ?
That is not a rom. It's a RUU. It will wipe all data from your phone.
The thread I mentioned before has all info needed about flashing RUUs.
New Dev.Deodexed Rom with April Security Patch based on latest Developer 4.30.617.12 version:
All worked fine upgrading from 4.30.617.2 to 4.30.617.12.
It works OK on other rooms with T-Mobile or China.
Try flashing the boot.img extracted from the firmware u have on phone after installing Maximus.
Always do a backup of your current working ROM ...