STM32G4，Set Chip Read Protect，then can not connect the Chip。(had solved)

[csinu]

I used STM32CubeProgrammer，And Set Chip Read Protection（RDP:0xCC），

Now The Chip can not be connect By JLINK STLINK either Usart�?

is there some method to reset the protection level？

the problem had be solved，detail below：

Level 2: No debug

In this level, the protection level 1 is guaranteed. In addition, the Cortex®-M4 debug port, the

boot from RAM (boot RAM mode) and the boot from System memory (boot loader mode)

are no more available. In user execution mode (boot FLASH mode), all operations are

allowed on the Flash Main memory. On the contrary, only read operations can be performed

on the option bytes.

[Bob S · Accepted solution]

Time for a new chip unless your code already in the chip has a way to update itself. As I mentioned here

https://community.st.com/s/question/0D50X0000BFx3rSSQR/this-question-about-sbsfu-software-package-from-st-official-websiteand-i-download-the-sbsfu-package-to-my-stm32f413i-find-the-jtag-hw-interface-is-forbidden-how-can-i-do-to-download-other-programmer

Once you set RDP level 2 there is no going back. All JTAG/SWI access to FLASH and option bytes is blocked. The statement "in user execution mode ... all operations are allowed on the FLASH" means that the program running in the CPU can read, erase and program FLASH. But no external access is allowed.

[Amel NASRI]

Hi @csinu​ ,

Could you please tell us how your problem was solved?

-Amel

[csinu]

@Amel NASRI (ST Employee)

Yes，My problem was solved。thank you，and thanks ST�?�?

Do I need to mark the problem was solved on this page？

[csinu]

@Amel NASRI (ST Employee)

I find Community is good for us（learner and engineer）。

when i public a question，and i can get the answer next day�?�?​haha

[Amel NASRI]

@csinu​ ,

Glad to know that your problem was resolved. The more important is to share the solution with other members. In fact, someone else may face the same issue and your solution will be helpful for him.

If in this case the proposal of @Bob S​  was the solution for you, just click on "Select as Best" :)

-Amel