Expected value for Option Byte "RDP": 0xBB, found: 0xAA

Products & Technology LoRa
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1

I am working on LoRa-E5 mini. When I try to erase the chip, I receive the error Error: Mass erase operation failed. Please verify flash protection. So I am trying to set RDP on level 0 to 1, but I am getting an Error: Expected value for Option Byte “RDP”: 0xBB, found: 0xAA Error: Option Byte Programming failed or modified by application after OB_LAUNCH.

Any help would be greatly appreciated.

2

Hi, I am facing the same problem with my LoRa wio e5. Did you solve it? If so how?

3

I didn’t find the any exact solution. But if you have to change the Option byte from 0xAA to 0xBB and then try it might work. Let me know if it worked.

4

LoRa-E5: Mass Erase Fails & RDP Option Byte Programming Error

I am working with the LoRa-E5 module (STM32-based MCU). When attempting to erase the chip using STM32 programming tools, I encounter the following error:

Error: Mass erase operation failed. Please verify flash protection.

To resolve this, I tried changing the Readout Protection (RDP) level from Level 0 to Level 1. However, I am running into another issue during Option Byte programming:

Error: Expected value for Option Byte “RDP”: 0xBB, found: 0xAA  
Error: Option Byte Programming failed or modified by application after OB_LAUNCH.

What I’ve tried:

  • Attempted mass erase via STM32CubeProgrammer

  • Tried setting RDP from Level 0 (0xAA) to Level 1 (0xBB)

  • Repeated attempts after reconnecting and resetting the board

Questions:

  1. Why is the RDP value not updating (still reads 0xAA)?

  2. What could cause the “Option Byte Programming failed or modified by application after OB_LAUNCH” error?

  3. Is there any additional step required to disable flash protection or successfully perform a mass erase on LoRa-E5?

5

pradeepkumar,

I remember reading somewhere that you should set SUBGHSPISD to 1.

Try searching for it online.