STM32WB55 custom UID

miguekun · ‎2026-03-26

Hi,

UID is set at factory for all products?

Wholesale ICs comes already programmed? I need to repair some machines and IC needs to have same UID as replaced.

Thanks

TDK · ‎2026-03-26

The UID can't be set or changed. (That would make it non-unique.)

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View solution in original post

TDK · ‎2026-03-26

The UID can't be set or changed. (That would make it non-unique.)

If you feel a post has answered your question, please click "Accept as Solution".

Andrew Neil · ‎2026-03-26

Yes, There is a UID built-in to the STM32:

https://community.st.com/t5/stm32-mcus/how-to-obtain-and-use-the-stm32-96-bit-uid/ta-p/621443

If you don't want to use that UID, you will have to adapt your code to take its UID from another source.

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.