I don't recall the retune message box I was getting as having a "later" button I also recollect it being more square than af123's picture. Could there be two messages? One message when a new service is detected and the other an advisory relating to DSO.
My message popped up once while watching and I dismissed it. It then popped up at switch on for the next two days before relented and did a manual retune at a time that suites, as I am away next weekend. The only new channel found was HD Red Button
One thing I did observe is that once my external hard drive was detected at switch on, it seemed to dismiss the message after a couple of seconds. This is why I don't recall exactly what it said. Plugging in a USB stick might be a partial work around.
I have only had my box a couple of months and it has a two year warranty, so I am hesitant to move to custom firmware just yet. In member's experience, how long before Humax address the retune and dead radio problems? I may revert back to 1.02.20, but having read about the deleting issues, the disk fix option in the latest version looks useful. If I did revert back, would I have audio playback problems with HD recordings made with 1.02.28?