Essentially, it is a massive database that provides the algorithms and hexadecimal offsets required to change the mileage data stored in a vehicle's EEPROM (Electrically Erasable Programmable Read-Only Memory). It supports thousands of vehicle models, ranging from budget hatchbacks to luxury SUVs. Key Features of the Tool

The "bin" file from the chip is analyzed. You use the Tachosoft Calculator to determine what the new data string should be to reflect the desired mileage.

A hardware programmer (like UPA-USB or XPROG) is used to read the data from the EEPROM chip.

To use Tachosoft 23.1, you cannot simply plug a laptop into a car’s USB port. It usually involves a multi-step hardware and software process:

Tachosoft is one of the most well-known names in the "mileage correction" industry. Version 23.1 is often cited as one of the most stable and comprehensive versions of their calculator.