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SM320F2808-EP: Flash failures on SM320F2808PZMEP processors

Part Number: SM320F2808-EP
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

We're have a product using the SM320F2808PZMEP processor where we flash it using a JTAG programmer.  This has worked well for many years but lately we're getting a lot of programming errors (see attached screenshots).

Replacing the processor seems to fix the problem but I don't necessarily believe the processors are actually bad.  I did attach a photo of one of the parts that shows lot code.

Soldering on the chips looks good as well.

Any suggestions?