Once you've made your changes, you'll write them back to the EEPROM.
It helps in synchronizing the hardware with specific software versions (like VCDS 18.9 or 19.6) so the cable remains compatible with newer car models. How to Use the Utility vagcom-eewritelang
Below is a concise, practical guide for using VAG-COM (VCDS) to write language settings via EEPROM/EEWriteLang or equivalent modules. Assumes Windows + VCDS (Ross-Tech) and an appropriate HEX/EEPROM interface (e.g., HEX-V2 / KKL / OBD-II cable) and a backup of original data. Once you've made your changes, you'll write them