Other Parts Discussed in Thread: MSP-GANG, MSP-FET
How is msp430g2553 encrypted?
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SBW/JTAG interface can be locked by fuse. After fuse is blown (by applying 6.5V) than it is forever (no reverse operation).
With blown SBW/JTAG fuse flash still can be updated by TI factory preloaded UART BSL that have access password (vector space).