As I now own a Magellan Maestro 4050, which unlike my 4250 has bluetooth and a headphone jack, I decided to upgrade the software. After hunting around a little I found Miopocket 4.0, a complete shell replacement for WinCE 4.x through 6.x GPS devices including smartphones with touch. It implements an iPhone-like interface and provides dozens of utilities, apps, and games.
Getting Miopocket installed gracefully on this unit is a bit of a chore because it is inexplicably different from its relatives. For one, it seems not to contain any support for autorun; I checked strings on all executables from the system and none of them contained any likely clues. I haven't checked DLLs yet, however. Consequently, only the "SD-free" (internal flash installation) works. Luckily, Miopocket 4 will fit into the device with nothing removed. Here's a quick overview of what I consider to be the best way to make the install. Note that following these directions correctly has the potential to brick your device if it varies from mine, or if I get them wrong. I will not accept any responsibility; follow these instructions at your own risk.
- Make a filesystem backup: This unit will connect to your desktop in USB-storage mode. In theory it little matters what OS you use; I used Windows 7 Professional x64. Copy the entire contents of the root of the system to a folder on your computer. Now make an archive from this folder for backup purposes, so you always have a totally clean backup to fall back to. I use 7-Zip.
- Merge Miopocket with your backup: This is much faster than making changes on the unit. Copy the Mioautorun and Media folders to your backup folder. Then open the APP folder in your backup, and rename Navigator.exe to Navigator_orig.exe. If you have Navigator_pna.exe instead of Navigator.exe, then rename it to Navigator_pna_orig.exe. Then copy Mioautorun.exe, Mioautorun.mscr, and MortScript.exe to the APP folder. Now rename the .exe AND the .mscr file you copied to the name of the Navigator executable you renamed. On my unit I have Navigator.exe, so you end up with Mioautorun.exe renamed to Navigator.exe, and Mioautorun.mscr renamed to Navigator.mscr.
- Tweak the Miopocket install: At minimum browse into the Mioautorun\Registry folder inside of your "backup" (which we are converting into an install... you DID make a backup of the backup into an archive first, right?) and move the SDHC.reg file to the "Exclude" subfolder. The SoC processor inside the Magellan Maestro 4050 does NOT have proper SDHC support! Installing SDHC support will seriously mess up your access to your SD card. Learn to live with 2GB SD cards.
- Format the Maestro 4050's internal flash storage: By default, the unit uses FAT; FAT32 is faster, even on flash. Once you've done this you are pretty well locked in to the process until you copy enough software back to the unit to boot it again. There IS a recovery process, which I have not fleshed out fully because I have not had to use it!
- Copy the software back to the unit: I used grsync, for which there is a very stable windows port. You can just use copy, but I had better results with rsync. Copy the entire contents of the backup folder right back to the root of the device.
- Force a hard reset: The only way I know to do this on this unit is to enter the recovery menu. Put the unit to sleep by holding down the power button, then press and hold the power button and the recessed reset button at the same time until the screen turns blue and gets text on it. Then hold down the power button until the screen gets funky, and let it go. Finally, hold the power button down until the unit turns on again. This erases all settings from the device and permits Miopocket to install cleanly. You might get away with a soft reset, simply pressing the recessed button once.
- Start Miopocket: A menu appears. Start miopocket, and let it run through its install.
- Manual reset: The unit goes to sleep. Hold down power until it wakes up and shuts off, then turn it back on, or just press the reset button once.
- Start Miopocket again: The menu comes back. You can set a timeout to make this menu not so obtrusive, or configure to start Miopocket every time. Since SOP is to put the unit to sleep and never turn it off, I set a ten second delay... which I rarely see at all.
After this, Miopocket will go through a second setup process, then launch Miopocket. Congratulations, you've upgraded!
See the first link in this article for possible debricking if you boned it.