dear all, I've recently bought a nucleo-144 stm32H743zi board and i am trying to program it using its on-board st-link V3 but i am facing with these errors. does anyone know how to fix this.

[MGhad.1]

[TDK]

Ensure it's not write protected and try a full chip erase.

Seems to be a theme. Two hits out of many others:

https://community.arm.com/developer/tools-software/tools/f/keil-forum/35993/error-flash-download-failed---cortex-m4-contents-mismatch

https://community.arm.com/developer/tools-software/tools/f/keil-forum/34174/contents-mismatch-keil-microcontroller-1986be91t

[Tesla DeLorean]

Check the flash algorithm settings down under the debugger settings.

Check banking options, if failing with dual bank, pick single bank, or reverse.

Check address of supported FLASH, can appear at a couple of addresses.

Make sure it recognizes you have an ST-LINK/V3, needs current drivers and DLLs.

Need one of the more recent MDK releases, V5.30 should be available current, wouldn't use anything older than 5.27