How to connect Mitac Mio P550 to a PC?

You can get the Master Reset Code from the service provider and reset it.

First try a reset... then try turning off the little power switch next to the reset, then turn it back on. If none of this works, your firmware is likely corrupted... then: You either need to return it to Mitac or locate (Google) & flash the firmware file into the unit as follows:

Connect the mio p550 to PC
1.put the Button of the PDA in ON position
2. hold the joystick downward and press the reset button
3.choose "Image Upgrade tools"
4.choose "0=Image by USB"
5.intall the usb driver (PC require the drivers). The driver in the
folder "USB driver" that comes with the firmware file.
6.open the software "dnw5.0e" (also comes with the firmware package).
7.(if you want to make a test of connection USB, click the "USB
port/Status". If all is ok go to step 8
8. click "USB port/transmitted" and to show the way of the file
"MioP550 - Osc260A R05_P09.nb0"
9.press the reset button to restart the mio p550.

You'll need to find the firmware (ROM) image file (Google) and then: Connect the mio p550 to PC
1.put the Button of the PDA in ON position
2. hold the joystick downward and press the reset button
3.choose "Image Upgrade tools"
4.choose "0=Image by USB"
5.intall the usb driver (PC require the drivers). The driver in the
folder "USB driver"
6.open the software "dnw5.0e"
7.(if you want to make a test of connection USB, click the" USB
port/Statute". If all is ok go to step 8
8. click "USB port/transmitted" and to show the way of the file
"MioP550 - Osc260A R05_P09.nb0"
9.press the reset button to restart the mio p550.

Good luck!

up arrow + power_on until MIO logo

I removed the rubber infill that covered a hidden screw. Released screw and then removed back plate. Removing the battery then required care as it is stuck with two sided tape to the Mio internals. Here I used a knive to prise/cut free.

Try this : Open your device ( it have 5 screws). Inside next to the sd card reader are two metallic sponges. Take them off ( they are glued on some electronic parts and it's shorting the circuits)

Had the same issue with my Mio P550's using an Airlink680W Wireless N Router and security mode WPA-PSK, TKIP & Password. I had to disable "Block WAN Ping" on the firewall and life is good.

BSL

I had the same and contacted MIO (use the phone number for your country,
http://www.mio-tech.be/EN/support/support-overview.php
). It was related to the shock the screen got and they graciously changed it for me (it was during the second year of the warranty). If the warranty has expired, you are probably looking to about a hundred bucks expense.
Courage,

on/off switch in "off" position for at least 30 seconds, then turn it in "on " position, power on and "reset". You'll lose all your data and all the installed programs.
Alternative: using the screen options, go to "system info", and choose "hard reset".
Beware: pushing the joystick down while doing a reset will get you a boot menu with memory-formatting options. Choose "exit".
Otherwise look into xdadevelopers forum (Google it or go to, say,
Mio P550 / P350 ROM upload [Archive] - xda-developers
)
A good idea would be to backup your data in the first place- just a hint.
Enjoy.

Try a other usb cable had same problem new cable fixed it of other device