Incorrect option bytes setting has blocked FLASH, how to unlock FLASH
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‎2020-06-07 4:00 AM
HI all,
I tried change option bytes for STM32WB55 in code, and probably something went wrong when I did this. After programming MCU I found that my flash was probably be blocked:
How can I unblock FLASH? I tried change security config options in STM32CubeProgrammer, used CLI, used DFU mode but It didn not help. In all the time I have error:
STM32_Programmer_CLI -c port=swd -ob SFSA=0xcb
-------------------------------------------------------------------
STM32CubeProgrammer v2.4.0
-------------------------------------------------------------------
ST-LINK SN : 066FFF393738425043065240
ST-LINK FW : V2J35M26
Voltage : 3.27V
SWD freq : 4000 KHz
Connect mode: Normal
Reset mode : Software reset
Device ID : 0x495
Device name : STM32WB55xx
Flash size : 1 MBytes
Device type : MCU
Device CPU : Cortex-M0+/M4
UPLOADING OPTION BYTES DATA ...
Bank : 0x00
Address : 0x58004020
Size : 104 Bytes
██████████████████████████████████████████████████ 100%
PROGRAMMING OPTION BYTES AREA ...
Bank : 0x00
Address : 0x58004020
Size : 104 Bytes
██████████████████████████████████████████████████ 100%
Reconnecting...
Reconnected !
UPLOADING OPTION BYTES DATA ...
Bank : 0x00
Address : 0x58004020
Size : 104 Bytes
██████████████████████████████████████████████████ 100%
OPTION BYTE PROGRAMMING VERIFICATION:
Error: Expected value for Option Byte "sfsa": 0xCB, found: 0x0
Error: Option Byte Programming failed
Greetings
Solved! Go to Solution.
- Labels:
-
Flash
-
STM32CubeProgrammer
-
STM32WB series
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‎2021-06-22 7:01 AM
hi
My MCU has FUS version the chip is V0.0.0, how clearig flash memory in this wersion ?
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‎2022-06-08 8:37 AM
Same thing. I tried to change watchdog option bytes and mcu somehow set SFSA as 0x0 and blocked the flash completely.:pouting_face:
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‎2022-06-08 8:48 AM
Can you still access the option byte ad dtry to set the watchdog option back to its original value.
Then try
- STM32_Programmer_CLI -c port=swd -w32 0x5800040c 0x00008000
The SFSA value should revert to 0xF4 with all the user memory erased of any previous FW.
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‎2022-06-08 8:49 AM
Additional questions:
Is it your custom board or an ST board?
What is the FUS version installed on that board?
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‎2022-06-15 2:53 AM
Thank you for quick reply! Fortunatelly I had FUS v1.2.0, so this command helped me. However i didn't get how to use this command, because I never worked with cubeCLI, but I've read FUS manual again and found same instruction in Q&A and tried it in cubeprogrammer with GUI. So it worked. MCU has been unbricked. Thanks again!

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