I have the same GPS, the 1424, and I managed to get it going. I had to change two configuration files. The first change probably wasn't necessary, but you might as well do it anyway to follow the same steps I did.
I opened the Navigator.mscr file (in the MioAutoRun folder on the GPS) in notepad. I then scrolled to the following section, and changed some code:
If(ScreenWidth() <= 320)
ElseIf(ScreenWidth() < 640)
This may not be necessary, but I thought that the setup process was hanging up on the resolution detection.
Then, when that still didn’t fix it, I tried one final thing. I opened the MioAutoRun folder that I copied to the GPS, and opened the MioPocket.ini file that had been created when I first powered it on.
In there, I changed one setting: right near the top, the first option Unlock, I set StartupMenu=0. This means it won’t ask what you want to start from, it will simply starting in MioPocket right away. That solved the problem.
Power it on, and let it go through the invisible install process. After about 2 minutes it will restart in MioPocket (probably less than 2 minutes).
That worked for me, hopefully it works for you!