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LM3S3748: cannot enter debug mode/ cannot access momery

Part Number: LM3S3748

Hi all,

We have LM3s3748 custom board.

They normal download flash firmware until yesterday.

I have issue: sometimes "cannot enter debug mode", sometimes "cannot access momery".

So that i cannot flash firmware any more.

Can any one have the same issue and please share me how to fix this issue.

Thaanks!

I use SDK Keil uVisionv5.31.0.0

Bootloader: ARM JTAG USB Ulink2

Lm3s3748 customer develoment board.