If your box updates to version 6.XX and if iTV Viet is missing any add-ons, then you don't need to factory reset; it takes longer time to recover.
How to clear data:
Home - settings - Apps, or Info - more settings - ok - Apps -OK .
iTV Viet -ok- clear data -ok- wait until clear data shows up 0.00B.
Return Home and reopen iTV Viet. Wait for 5-7 minutes. Your box will update to the latest version.
After it updates to the latest version, you can go to the left menu - Help menu - ok- to install, update or uninstall Apps.