MSP430G2433: Brown out reset ,lpm

You can't disable brownout reset nor should you want to. You want the CPU to do something predictable as power fails rather than wander off doing who knows what.

LPM places the system into a particular sort of sleep with various things turned off to save power. Exit is via an interrupt, or in the extreme, a reset.

You don't enable or disable LPM. You must explicitly enter a low power mode by fiddling with bits in the CPU status register.

This is all described in the family guide for each part. Document SLAU144 in this case.