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MSPM0L2228: Breakpoints suddenly stopped working in CCS Theia 1.5.1

Part Number: MSPM0L2228

Tool/software:

I was happily working away earlier debugging some code, when all of a sudden breakpoints could not be enabled.

Simply setting a breakpoint now results in it being automatically disabled, as shown below:

I am running CCS Theia 1.5.1 with version 3.0.0.32 on the debug probe.

I cannot update to CCS 20 with debug probe version 3.0.0.33 because of the issue described in https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1460046/mspm0l2228-can-no-longer-debug-anything-call-stack-indicating-0xfffffff8.

Please can you advise how we can proceed?