The Manchester boyband, who were put together by former Take That manager Nigel Martin-Smith, were forced to leave X Factor after their first audition because of their management connections.
"It was a huge knock for us. We'd done this for three years and we've always just kept hoping we'll get something out of it. It means everything to us and music is the biggest thing in our lives," they told Digital Spy.
"Leaving The X Factor was probably one of the darkest stages of our lives. There were some really dark days for us... It was probably our families as well as each other that kept us going."
Jayme Kontzle, Craig Worsley, Dean Kelly and Kris Evans regrouped after the rejection and re-auditioned for Britain's Got Talent. The four-piece's performance of 'Sitting on the Dock of the Bay' was one of the highlights of last weekend's auditions show.
"When we did X Factor Simon Cowell wasn't on the judging panel. So I think Britain's Got Talent has worked out a lot better for us," they said.
"A thing that record labels always say to us is, 'How big are you on the internet?' and we're not really big at all the online stuff. They wanted us to already have a fanbase. Everyone was saying, we had potential, do more gigs and get your own following. They are only interested if you are the finished product.
"So we need a show like Britain's Got Talent."
Joking about potentially working in the future with both manager Nigel Martin-Smith and Simon Cowell, they added: "To have Nigel and Simon together, it blows everyone else out of the water. They would be a super force together.
"We know Simon has worked with groups like Westlife who do ballads. We can do that, we're not saying we won't do that. But it depends how big the stools are!"
Britain's Got Talent airs on Saturdays at 8pm on ITV1.
> 'Britain's Got Talent' review: Xylophones, 'No Name' and burlesque