Hi JC50030, The issue is most likely not due to the MSP-FET430UIF devices, if the HW works perfectly fine after programming using FET-Pro430 then I would assume that the main memory read data is incorrect. The FLASH26 errata indicates that this is possible due to the supply voltages and addressing mode: www.ti.com/.../slaz169j.pdf Could you try using an external power supply instead of the MSP-FET430UIF to power the MSP430 and comment on its effect? Are you only able to test on one board/device or do you have multiple available? Do you have a MSP-TS430DA38 to debug on? Additional E2E threads for some light reading: https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/273446 https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/243408 Regards, Ryan
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