Some brands (e.g., Pro-face, Beijer, Maple Systems) offer a password removal service upon proof of ownership. You send them the HMI or a memory dump, and they return a clean unit or provide a master reset file. This is not free, but it is legal and safe.
Assuming you own the HMI and have lost the password, here is a real procedure for a common v42 firmware HMI from 2021:
Requirements:
Steps:
This is the only safe, legal method for v42 2021 Weintek HMIs.
If you want to find official procedures, try searching:
"How to reset PLC password" [brand name] service manual
"HMI password recovery" [model] support site
"Forgotten password" TIA Portal Siemens support
"Recover .mer runtime password" Rockwellplc hmi password unlock v42 2021 free
Avoid searching for "free unlock", "crack", or "v42 bypass" – these lead to malware or scams.
If you are the legitimate owner or authorized integrator, here are proper approaches:
| Brand | Solution |
|--------|----------|
| Siemens (TIA Portal) | Contact Siemens support with proof of purchase → they may provide a recovery file or procedure. |
| Rockwell Automation | Use the "FactoryTalk View ME/SE" password reset utility (requires original project file). |
| Weintek (EasyBuilder Pro) | Open the .emtp project file → If password lost, contact local distributor with serial number. |
| Mitsubishi | Use GX Works3 → Password can only be reset by clearing the PLC memory (program lost). |
| Schneider | SoMachine / Machine Expert → Requires service tool from Schneider support. |
| Omron | Sysmac Studio → Password stored in hardware → reset requires clearing memory. | Some brands (e
Key point: Most v42 / 2021 software (like TIA Portal V17/V18) have stronger encryption – no public cracks exist.
Many technicians never change default credentials. Before attempting anything drastic, try these common defaults. They remain prevalent even on 2021-era v42 firmware.
| Brand | Device Type | Default Username/Password |
|--------|-------------|----------------------------|
| Siemens | S7-1200 PLC (protected block) | "Author" / "Author" or blank |
| Weintek | HMI | (No user) / 111111 or 888888 |
| Allen-Bradley | MicroLogix PLC | Binary / Binary |
| Schneider Electric | Modicon M221 | Administrator / blank |
| Delta | DVP PLC | blank / 66666666 |
| Omron | NB HMI | blank / blank | Steps: