Below is a quick guide on Reset your Nokia E66 Device, the guide covers step by step to Soft reset or Hard Reset the Nokia E66 device.

1.- Basic Reset or Soft Reset
This option restores the .ini files from the ROM.
Does not erase data (photos, videos, documents) or applications from
a third party. Key Code *# 7780 # (click this combination of keys on the keyboard in the mobile)

2.- Total Reset or Hard Reset
This option restores the original operating system from the ROM.
Formats the C: partition and deletes all data including the memory
card. Key Code *#7370# (click this combination of keys on the keyboard in the mobile)

Important: To proceed to reset, the battery must be full and the
mobile device connected to the charger. If during the course of reset,
the mobile stop receiving electricity it can ruin the internal flash
memory of the mobile device and stop function.

Thanks to resetnokia.com

Facing some problem with your Nokia N8 device?? don’t worry you can hard reset it to resolve those problem. So how to Hard Reset the Nokia N8?? well, just follow the simple steps below!

1. Turn off your phone.
2. Hold “Volume Down + Camera Key + Menu Key” and press power button until until the phone vibrates.
3. Done, just wait until screen show properly.

Problems might appear after doing full format:

1. You lost Ovi Maps. However, you could reinstall it by download it here
2. You also lost Ovi Store 2.0 and you can’t reinstall it since it always show “Unable to install”.

So please DON’T do full format if not neccessary or actually I must say that DO IT ONLY AS YOUR LAST CHOICE.

Read this guide if you wanna hard reset your Nokia N97 device.

Steps “How to Hard Reset Nokia N97″

1. Back-up your files and contacts to a memory card.
2. Make sure the battery is fully charged
3. Turn off your Nokia N97
4. Press the green dial key, star key (*) and 3 key (3) all together
5. Press the power button for 1 minute to switch on the n97. Do not let go of the three keys until “formatting” is displayed.
6. wait for a couple minutes till formatting is done.

Now your Nokia n97 has back to default setting.
Or here is the other way.

1. Turn off phone
2. Take out SIM Card (only so you dont have to deal with the network err when resetting)
3. hookup USB so the charging begins
4. Turn on the phone
5. Once the phone comes up DO NOT LET IT LOCK it will not unlock if you do
6. Open the slider and just dial a few numbers
7. Wait however long you need for the dialpad to come up.
8. Use the dialpad to punch in *#7370#
9. Profit
10. Repeat shortly when it bricks itself again.

If you have a problem with your Nokia N900 and want to format or hard reset the device, you can follow the steps on the image below. Just click the image to enlarge, so you can read the detail about How to Hard Reset Nokia N900.

If you have problems or errors with your Nokia E75 and need to Full Reset, Soft Reset and Hard Reset the phone, This guide will be very useful for you.

Nokia E75 Soft Reset:
This option restores the .ini files from the ROM.
Does not erase data (photos, videos, documents) nor applications from a third party. Key Code *#7780# (click this combination of keys on the keyboard in the mobile)

Nokia E75 Hard Reset:
This option restores the original operating system from the ROM.
Formats the C: partition and deletes all data including the memory card. Key Code *#7370# (click this combination of keys on the keyboard in the mobile)

You can also achieve Total Reset by pressing and holding down following keys: * + 3 + Green Button (call) immediately after turning the mobile on.

Note: To proceed to reset, the battery must be full and the
mobile device connected to the charger. If during the course of reset, the mobile stop receiving electricity it can ruin the internal flash memory of the mobile device and stop function.