Unlock Siemens S7-300 / S7-400 PLC Password
Remove write-protection from Siemens S7-300 and S7-400 PLCs over Ethernet — no MMC card or special programming cable required. If you'd rather have it handled, I provide manual Siemens recovery support — done personally, with nothing sold or downloaded from this site.
Supported software & hardware
- Siemens S7-300 and S7-400 CPUs
- Access protection Level 2 (write-protection)
- SIMATIC Manager / STEP 7 Classic (v5.x) projects
- Ethernet connection (no MMC card or MPI cable required)
Who this is for
- You forgot or lost the write-protection password on your own S7-300 / S7-400 PLC
- A previous engineer left and no password record was kept
- You've inherited a legacy controller you legally own and need to maintain
- You can only reach the PLC over Ethernet (remote site, no physical access)
Locked out of a Siemens project you own?
Send the software and version, and a short description of what you're locked out of. The work is manual and done personally — no tools sold, no downloads.
Email for recovery support More on YouTubeQuestions
Which products and versions does this cover?
It applies to Siemens S7-300 and S7-400 CPUs, Access protection Level 2 (write-protection), SIMATIC Manager / STEP 7 Classic (v5.x) projects, Ethernet connection (no MMC card or MPI cable required).
Who does the recovery?
I do, personally. Every job is manual — it isn't automated with a tool and it isn't resold to anyone else.
Do I have to own the equipment?
Yes. I only help owners and authorized maintainers regain access to their own projects — in line with the authorized-use-only policy on the channel.
Do you sell a tool or a download for this?
No. There are no tools for sale and no downloads on this site. Recovery is a manual service I perform or guide you through.