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If the machine is operational but you just want to upload the code, check the SD card or USB ports on the HMI. Many HMIs auto-backup project files. If you have the project file, the password might be stored in a readable configuration file or the file itself can be imported into the development environment.
If you have the original project file but are locked out of specific blocks, some engineering software (like TIA Portal or GX Works) allows password recovery through registered account credentials if "User Management and Access Control" (UMAC) was utilized. plc hmi password unlock v42 free better download
or similar "cracking" tools poses extreme risks to both your computer and the industrial systems you operate. If the machine is operational but you just