Id hardware in OTP STM32f207

[LKint.1]

Hi everyone!

​I am using 1 piece of hardware that uses an STM32f207igh6 that has a registration number on it (serial). However, every time the STM32 f207 chip is damaged, it is necessary to replace the chip with a new one, so that the registration number matches the application in use. Previously, an expert helped me to do that, he said need to generate OTP for chip with old id number (serial) of broken chip, he asked me to use stlink stm32 utility of the program. start reading from address 0x1FFF7800 size 400 of the brand new chip and send him this data. Then he sent me a flash file using ST Link V2. Everything went smoothly. But now I can't contact him anymore. Can anyone here help me with this problem?

Thanks!​

[Tesla DeLorean]

So use the file he sent you last time...

[LKint.1]

Thanks for your advice. But the repository is broken so I can't use it again. I'm looking for a way to save my device and want to use it as a backup for it later

[Tesla DeLorean]

Have you at least saved the critical data like you were instructed to last time?

[Piranha]

Open the file in HEX editor (for example HxD), find the number and modify it.

[Tesla DeLorean]

Likely Hashed or Cryptographically Signed.

If these things are prone to continually burn up perhaps the vendor will assist you.