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Further to my reply, here's what you need to do. Bear in mind that it was some while ago that I flashed the firmware of mine and that therefore I can't guarantee that various files will still be available. You'll need to find out where to download the installer file but hopefully someone else will be able to help, there. It was from an ftp site, I think. I'm still searching in my notes for a record of it.
Note that 6.1.4.7 does not provide for graphical output from the utility DMT. However, you can still use DMT with 6.1.4.7 to set a revised target SNR.
The binary file (the new firmware) is called ST5x6v5 6.1.4.7 UK.bin and is contained in ST5x6_v5_UK_firmware6147.zip, downloadable from the Speedtouch website. It sounds like you've already got that. The installation wizard for this is the file upgradeST.exe, which is contained in a corresponding but separate zip file. As I say, I seem to recall that the installation zip file was available from an ftp site that someone else in these forums quoted, but unfortunately I don't seem to have a record of the URL. Anyone?
Anyway, assuming you can get that file, here's the procedure:
Unplug the DSL cable from the router. With the router power on, do a factory reset of the router, by holding the reset switch down in the tiny hole at the back of the 546 (see 546 manual). Temporarily turn off your screensaver, antivirus and any additional firewall.
In Windows, navigate to the folder where you've unzipped the installation file and double-click on upgradeST.exe. Ensure that the connection between router and PC is enabled, because at this point the wizard will be searching for the router and obtaining basic data from it. Follow the wizard's instructions. Use 'administrator' for username and, for password, leave blank.
In the dialog box that follows that, click 'Have Disk' and browse to the folder ST5x6_v5_UK_firmware6147. This folder will contain ST5x6v5 6.1.4.7 UK. bin. Press OK, then Next.
The upgrading of the firmware will then start. A progress screen will show. Do nothing; just wait. The upgrade takes about 3 mins to complete. When done, press Finish.
Leave the DSL cable disconnected. Open the browser and, at the Welcome window, click on 'Set up my Speedtouch'. A wizard then runs which takes you through simple configuring of the router. Set to Data (Default), and enter all the other basic data for your particular connection. Later, fully configure the 546, using the Toolbox menu of the router.
Connect the DSL cable and wait for the router to sync the line.
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