I already check in sammobile but no available firmwares in sm-n915xSamMobile Firmwares has some ROMs for the phone - not all, but some.
What happens if you flash a different variant? That depends on the variant and what you flash. They may be close enough to work, they may be far enough apart that the phone stops working.
Any advice thanksIf it's not on Sammobile, it's probably not available. (But an 'X' variant?)