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How can I disable RDP2?

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AGóme.3
Associate

‎2022-11-07 02:05 AM

Hi, I was testing the different levels of read protection and when I activated RDP 2, I lost full access to my board. I would like to know if there is any way to regain access (do a downgrade), despite losing all the content I had installed, something like a hard reset, ...

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Peter BENSCH
ST Employee

‎2022-11-07 02:41 AM

Welcome, @Alfonso Gómez Martínez​, to the community!

RDP2 is unfortunately (or fortunately) a one-way street, which is also described in the reference manuals, e.g.:

When the read protection Level 2 is set:

  • All protections provided by Level 1 are active.
  • Booting from RAM or system memory bootloader is no more allowed.
  • JTAG, SWV (single-wire viewer), ETM, and boundary scan are disabled.
  • User option bytes can no longer be changed.
  • When booting from Flash memory, accesses (read, erase and program) to Flash memory from user code are allowed.

Memory read protection Level 2 is an irreversible operation. When Level 2 is activated, the level of protection cannot be decreased to Level 0 or Level 1.

It looks like you have just bricked the device.

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

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Peter BENSCH
ST Employee

‎2022-11-07 02:41 AM

Welcome, @Alfonso Gómez Martínez​, to the community!

RDP2 is unfortunately (or fortunately) a one-way street, which is also described in the reference manuals, e.g.:

When the read protection Level 2 is set:

  • All protections provided by Level 1 are active.
  • Booting from RAM or system memory bootloader is no more allowed.
  • JTAG, SWV (single-wire viewer), ETM, and boundary scan are disabled.
  • User option bytes can no longer be changed.
  • When booting from Flash memory, accesses (read, erase and program) to Flash memory from user code are allowed.

Memory read protection Level 2 is an irreversible operation. When Level 2 is activated, the level of protection cannot be decreased to Level 0 or Level 1.

It looks like you have just bricked the device.

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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