I am working on RDP programming on STM32U575 . My query is how can i perform RDP 2 to RDP 1 regression(or RDP 1 to RDP 0) using OEM keys in my firmware ?

[vsing.1]

I found an application note for regression of RDP level using OEM keys via STM cube CLI .

But my use case is to do it by firmware .

Can it be done ?

/Jaroslav HOUDEK​  @zqizh.1​ 

[TDK]

RDP2 is irreversible.

RDP1 to RDP0 is possible, but causes your chip to be erased which makes it difficult/impossible to do within your firmware while still retaining control.

[vsing.1]

@TDK​  This snip is from rm0456 application note for STM32U5x5

They have supported a regression from RDP2 to RDP 1 using passwords