In the options menu, selecting "Erase All Flash" is often necessary for a clean install or if you are downgrading to an "open-line" version. Connect Device: Click the Green Arrow/Start button in the software first.
Since these files are usually hosted on third-party firmware repositories rather than official Vodafone sites, here are the most reliable places to find them: Firmware Download Resources vodafone m028t firmware full download
The SW Downloader Tool (often included in unlock packs) is the standard utility for writing firmware to the device's flash memory. In the options menu, selecting "Erase All Flash"
The safest way to get the latest firmware is through the device's own settings. In the options menu