How to MOD Nokia DCT-3 phones using a flasher box (home made Dejan flasher)

Summary

The presenter demonstrates a homemade Nokia DCT-3 service box that combines a Dejan-style parallel-port flasher with a serial M-Bus connection.

The parallel connection is used to read and write phone flash memory. The serial connection supports tasks such as reading phone information, unlocking, resetting security settings, and changing logos or other customizations. A MAX232 chip handles the serial connection, and a switch selects between serial and parallel modes. The box is generally powered through the phone cable; USB supplies 5 V when using a cable with its own battery.

A Nokia 5110 is used for the demonstration. The presenter notes that the associated programs were designed for Windows 98 but can be run on Windows XP with adjustments, including using PortTalk to allow access to the parallel port.

Demonstrations and tools

• Flash and restore: The presenter explains how to convert MCU/PPM flash files to the required format, select a language package, and write the flash through the parallel connection. A flash intended for a different phone is accidentally used, so the phone is restored from its original backup. The key advice is to make a backup before flashing.
• Unlock and reset: After flashing, the serial connection is used to inspect phone information, reset the phone to factory defaults, unlock it, and update the FAID. A separate Nokia utility is also shown for reading security information and performing resets and unlocks.
• Customize the phone: Flash-editing and scripting tools can alter fonts, ringtones, languages, menu icons, graphics, and other features. A script changes the displayed battery and signal indicators from four bars to seven, and the presenter flashes the change onto the phone.
• Logos and media: A logo manager can capture the phone’s current screen and upload replacement operator logos. Other utilities include a JAR-to-JAD converter for games, ringtone tools, and a language-file splitter/fixer. Some features, such as MP3 transfer, are mentioned but not demonstrated.

The presenter also tests the cable connections and confirms that M-Bus works. The parallel-port test is not performed in that setup.

Main speaker/source: The video’s presenter, demonstrating the flasher and software on camera.