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High Performance ANSI C Compiler for Microchip AVR Microcontrollers

V4.06 release 1 October 2025

CodeVisionAVR

IDE - Automatic Program Generator - Graphic Library (Advanced) - ISP

Development Kit

CodeVisionAVR Advanced - LCD module with ATXMega A4U and a 2.4" or 9.0" LCD with Touchscreen - Optional AVR ICE

ChipBlasterAVR

Universal In-System Programming Software for the Microchip AVR family of microcontrollers

Support Extension

CodeVisionAVR includes 1 year of free updates and e-mail technical support. After this period purchase a support package to continue this service.

Quick order
Click on the blue buttons to quickly add a product to your cart.

If the program is stored on the MMC card (external Flash card), simply resetting the internal RAM does not remove the password. Upon next power cycle, the CPU loads the password-locked program from the MMC again.

For the S7-300 CPU, a memory reset using the physical key switch is the primary method to wipe the working memory, which effectively removes the password barrier. However, note that if one is inserted. To clear the MMC card, follow the steps below with the MMC inserted:

Unlocking the S7300 PLC password can be challenging, but several methods and techniques are available. It is essential to follow best practices to prevent password-related issues and ensure secure access to the PLC. The use of third-party tools is not recommended, and users should rely on official Siemens software and techniques to avoid potential damage to the PLC.

Release the switch once the LED flashes, then quickly set it back to within 3 seconds and hold until the reset completes. Wiping the MMC

When dealing with a forgotten password, engineers generally have three main routes to make the PLC operational again: A. The Official Siemens Reset Method (Wipe and Restore)

Before attempting any password bypass work, you must verify ownership and legal authorization:

Locate the encrypted or plain-text string representing the password, depending on the firmware version of your CPU. 4. Software Tools and Exploits

The most straightforward "unlock" method is to erase the password entirely. However, this means losing the program.

For the average plant electrician: Do not waste days brute-forcing. Order a new MMC card, perform a memory reset, and request the original program from the OEM or the corporate engineering archive. If that archive doesn't exist—use this as a lesson to implement a password vault system (e.g., IT Glue or Keepass) for every future PLC project.

: You can check these settings in the Siemens SiePortal under the "Protection" tab in the CPU's hardware configuration properties. 4. Recovery via MMC Card Reader

Save the changes, open STEP 7, and open the block. The code will now be visible. Method 3: The Complete Factory Reset (Data Erasure)

The password is stored in a separate EEPROM chip. It is hashed and embedded within the System Data block (SDB) inside the internal RAM or MMC (Micro Memory Card). On older S7-300 units (CPU 312 to 318-2), the password is stored directly on the MMC card. On newer firmware, it resides in the internal flash.

If everything you try works, you aren't trying hard enough."

Gordon Moore

One thing a leader does is to remove the stigma of mistakes."

Gordon Moore

With engineering, I view this year's failure as next year's opportunity to try it again. Failures are not something to be avoided. You want to have them happen as quickly as you can so you can make progress rapidly."

Gordon Moore

Moore's Law - The number of transistors and resistors on a chip doubles every 24 months."

Gordon Moore

The technology at the leading edge changes so rapidly that you have to keep current after you get out of school. I think probably the most important thing is having good fundamentals."

Gordon Moore

Most of what I learned as an entrepreneur was by trial and error."

Gordon Moore

No physical quantity can continue to change exponentially forever. Your job is delaying forever."

Gordon Moore

If you'd asked me in 1980 what the big impact of microprocessors would be, I probably would have missed the PC. If you asked me in 1990 what was important, I probably would have missed the Internet."

Gordon Moore

Unlock S7300 Plc Password Work Exclusive -

If the program is stored on the MMC card (external Flash card), simply resetting the internal RAM does not remove the password. Upon next power cycle, the CPU loads the password-locked program from the MMC again.

For the S7-300 CPU, a memory reset using the physical key switch is the primary method to wipe the working memory, which effectively removes the password barrier. However, note that if one is inserted. To clear the MMC card, follow the steps below with the MMC inserted:

Unlocking the S7300 PLC password can be challenging, but several methods and techniques are available. It is essential to follow best practices to prevent password-related issues and ensure secure access to the PLC. The use of third-party tools is not recommended, and users should rely on official Siemens software and techniques to avoid potential damage to the PLC.

Release the switch once the LED flashes, then quickly set it back to within 3 seconds and hold until the reset completes. Wiping the MMC

When dealing with a forgotten password, engineers generally have three main routes to make the PLC operational again: A. The Official Siemens Reset Method (Wipe and Restore)

Before attempting any password bypass work, you must verify ownership and legal authorization:

Locate the encrypted or plain-text string representing the password, depending on the firmware version of your CPU. 4. Software Tools and Exploits

The most straightforward "unlock" method is to erase the password entirely. However, this means losing the program.

For the average plant electrician: Do not waste days brute-forcing. Order a new MMC card, perform a memory reset, and request the original program from the OEM or the corporate engineering archive. If that archive doesn't exist—use this as a lesson to implement a password vault system (e.g., IT Glue or Keepass) for every future PLC project.

: You can check these settings in the Siemens SiePortal under the "Protection" tab in the CPU's hardware configuration properties. 4. Recovery via MMC Card Reader

Save the changes, open STEP 7, and open the block. The code will now be visible. Method 3: The Complete Factory Reset (Data Erasure)

The password is stored in a separate EEPROM chip. It is hashed and embedded within the System Data block (SDB) inside the internal RAM or MMC (Micro Memory Card). On older S7-300 units (CPU 312 to 318-2), the password is stored directly on the MMC card. On newer firmware, it resides in the internal flash.

ChipBlasterAVR

A Universal In-System Programming Software for the Microchip AVR family of microcontrollers

  • Compatible with most AVR development tools
  • Supports projects
  • Supports all AVR microcontrollers
This product includes 1 year of free updates and e-mail technical support. After this period you can purchase 'ChipBlasterAVR Support' to continue to receive free updates and support.

This is a download only product, nothing will be shipped to you. A free evaluation version is available. unlock s7300 plc password work

ChipBlasterAVR is (C) Copyright 1998-2020 by HP InfoTech S.R.L., All Rights Reserved. If the program is stored on the MMC

ChipBlasterAVR

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CodeVisionAVR FAQ

How will I receive my license?
You will receive your download link, install pasword and license ID, with a delay that may be up to 12 hours, from HP Info Tech by e-mail. Please also check your e-mail clients Junk folder as the e-mail might end up there. If you ordered the development kit, the hardware will be shipped to you and you will get shipment information.

How can I download CodeVisionAVR?
You can try the product before purchasing by downloading the CodeVisionAVR Evaluation V4.06: Free, 4kbytes code size limited version. PCF8563, PCF8583, DS1302, DS1307, DS2430, DS2433 libraries are not included. Includes also the Evaluation version of the LCD Vision font editor, with disabled saving of the generated font C source code.
The paid version can be downloaded @ CodeVisionAVR V4.06. This version does require an activiation code which is send to you after your purchase. This commercial version also includes the full LCD Vision font editor. The Advanced license is required to use LCD Vision and the color graphic TFT LCD libraries.

Where can I find the CodeVisionAVR User Manual?
Just download it: cvavrman.zip

How do I setup the software?
CodeVisionAVR V3 is designed to be used both in its own IDE and also as an Extension in Atmel Studio 7 or the older 6.2.1563. It is compatible with all Windows® versions down to XP. For the Atmel Studio Extension to be installed correctly, Atmel Studio must be already present on the computer, before the CodeVisionAVR installer is launched.
Note that while installing and using CodeVisionAVR you must be logged in as Administrator.
You must uninstall any Atmel Studio version older then 6.2.1563 and remove all remaining files in C:\Program Files (x86)\Atmel BEFORE running the CodeVisionAVR installer.

I get a warning from my virus scanner while installing CodeVisionAVR !
CodeVisionAVR is protected by WinLicense from Oreans Technologies. This protection may trigger false alarms in some antivirurses like BitDefender, ESET, AVAST or AVG, preventing CodeVisionAVR from being executed. In such cases you need to add the whole CodeVisionAVR installation \BIN folder to the antivirus file exclusion list.

Is Atmel Studio required?
No it is not. You can use CodeVisionAVR in its own IDE. For debuging you can also use the AVR Studio 4.19 debugger.

I want to use an older version of CodeVisionAVR
All previous versions of CodeVisionAVR can be downloaded, just ask us for the correct download link. Mind you that each version has a different install password. Please keep a record of the install password(s) which we send you. If you've lost your install password feel free to ask us. You can use the contact form.

Will I receive an invoice for my purchase?
Invoices are send by e-mail for all purchases. It might take a few weeks before you receive your invoice.

Privacy
Our shop does not store any information in an online database. That's why you can not use a login and have to enter your invoice data for each purchase. Your address is only used to send you an invoice. Your e-mail address is used by UVee to send you a purchase confirmation, and by HP Info Tech to send you the license. HP Info Tech will store your address to keep track of your license. On simple request (use the contact form below) UVee will erase all your data, or send you a copy of all your data records.
While using this webshop cookies are used to store your webshop data temporarily on your computer.

Payment with Stripe versus PayPal
Our new webshop uses the services of Stripe to handle your payments. Stripe supports all common creditcards, but also Apple Pay and Google Checkout in selected regions. It also supports local bank cards (region dependant). PayPal recently changed their payment system which resulted in higher costs for both you and us.

What about shipping costs?
CodeVisionAVR and ChipBlasterAVR are download only products, no shipping costs are charged.
All other products are shipped with bPost (first class Mail) and we charge €9.90 for EU destinations and €19.90 for all other destinations. You will get a tracking number once your order has been shipped. Shipping time varies depending on the location, EU destinations usually arrive within 5 working days. Longer distance shipments might take longer. If you want us to send your order with your preferred carrier (on your account), add your carrier account number in the comment field, we'll refund you the charged shipping costs.

Are there any export restrictions
We do not sell to residents of Iran, North Korea, and Russian companies with military subsidaries

CONTACT

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