even the BSL area is all erased, so the BSL is not usable also.
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even the BSL area is all erased, so the BSL is not usable also.
How do you know that flash is erased when neither JTAG nor BSL are working? Did you open the case and look at the flash with an electron raster force microscope?
I guess the facts are that the MSP is not responding to BSL nor JTAG anymore. Why this is, is yet unknown.
It is rather unlikely that the BSL is erased and the fuse blown. Because a 'blown' fuse is a not erased part of flash. Erasing flash will 'unblow' the fuse.
Also, erasing the BSL isn't easy. There are several security mechanisms preventing this. So it must be done intentionally (or be deliberately enabling the appropriate option in the flashing program).
If indeed the fuse is blown and the BSL erased, then all you can do is replacing the part. Dead is dead.
But there can be other reasons, including a bad soldering, shortcuts caused by flux remains under the chip that has drawn water from ambient. Maybe a broken trace on the PCB, a defect on the power supply and, finally, destruction of vital parts by over-voltage or ESD.
Anyway, the purpose of the fuse is to prevent access to the device and the (probably valuable) firmware in it, to prevent cloning of the device by someone who didn't put effort in the development. A simple way to restore the fuse would render it useless and make the MSP a device not recommended for commercial design.
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