Unable to dump program through STM32 ST-LINK Utility.

[Rac]

We are using STM32L151VCT6A MCU. I have already programmed and worked on the boards, but for 2nd time device is not allowing to read/write the program. And even the pin numb 72 is low at the MCU.

[Tesla DeLorean]

Sorry, what is pin 72?

If the device is powered down (low power mode), you might have to adjust the connectivity options.

You could also try pulling BOOT0 HIGH, and with NRST connected to the programming header.

[Rac]

Its the Pin numb of MCU (PA13).

[Rac]

We have tried by pulling BOOT0 high; even through no change at the MCU behavior.

Any other solution to erase and reprogram?

[Tesla DeLorean]

I'd probably try the USART method of the System Loader to see if the chip provided signs of life.

BOOT0 HIGH, Reset, then send 0x7F pattern at 9600 8E1 to USART1 PA9/PA10, and check for 0x79 response.​

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Device powered by battery?​

[Rac]

Device powered by 12V 2Amp adopter, Where a regulator divides the voltage and provides 3V3 to MCU.