Hi DJ-NG, The MSP430FR5738 incorporates a hardware UART bootloader, please specify how the customer is communicating with the BSL. Can the customer provide the full data packet that they are sending to the MSP430FR5738 BSL? It needs to use the following format: 80 21 00 11 [32-byte password] [2-byte checksum] To which I've calculated the checksum for the password provided above should be E8 2F. Remember that the password is based off of the old firmware that is currently programmed to the device and not the updated firmware. You could optionally have the customer perform a mass erase, this would reset the BSL password in which case the following packet should be successful: 80 21 00 11 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 9e e6 Here are some related E2E threads: e2e.ti.com/.../250785 e2e.ti.com/.../229597 Regards, Ryan
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