@shkhaliq could you post your st-probe output, maybe it prints a spurious 00 as last byte? It seems I also have the same which adds the extra 00 byte:

jjacobs@workbench ~/repos/github/stlink/build $ ./st-probe
Found 2 stlink programmers
563f6706677256563113066700
         flash: 262144 (pagesize: 2048)
          sram: 65536
        chipid: 0x0414
         descr: F1 High-density device
493f6d06667048513615106700
         flash: 1048576 (pagesize: 16384)
          sram: 196608
        chipid: 0x0413
         descr: F4 device

For openocd I have the following hla_serial which has no trailing zero byte:
hla_serial "\x56\x3f\x67\x06\x67\x72\x56\x56\x31\x13\x06\x67"

So this means the serials of the programmers have exact 12 bytes. Maybe someone can acknowledge this so we have correct output for st-probe and the struct stlink_t serial field then needs only 12 bytes instead.

Here are some other pages related to this:

http://wunderkis.de/stlink-serialno/
https://sourceforge.net/p/openocd/tickets/110/

Probe and control multiple connected programmers #318

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