The bootloader will intercept the power-on signal, and the progress bar will advance from 0% to 100%.
If you found the file on a forum, check if other users have posted file hashes to ensure your download hasn't been tampered with. gx downloader boot v1 040 download patched
The TX and RX lines are likely swapped. Try reversing the transmit and receive wires on your serial adapter. Additionally, ensure the device is completely powered down before hitting "Start," and only powered on after the tool is waiting. The bootloader will intercept the power-on signal, and
Note: The exact steps can vary depending on the specific modified tool you downloaded. Below is the standard procedure for this type of utility. gx downloader boot v1 040 download patched