How to Easily Master Format MICROSOFT LUMIA 640 LTE (DUAL) with Safety Hard Reset?

Tips and tricks for troubleshot problems at MICROSOFT LUMIA 640 LTE. This is middle class LTE smartphone from Microsoft to release their Microsoft Windows Phone 8.1 operating system for user who want to get faster Internet data speed with GSM LTE / 4G. This phone have 5 inches LCD touch screen, using Quad core processor smartphone at 1.2 Ghz clock speed from Qualcomm. We can get 8 GB internal memory and 1 GB RAM. If we want to keep more music or MP3 or movie or pictures, then MICROSOFT LUMIA 640 LTE have external memory slot up too 128 GB, of course we can insert it for smaller microSD size like 1 GB or 4 GB as well. This phone have 8 megapixel main camera in the back side. If we want to have Skype video call, using front 1 megapixel camera already enough for that. Please note, this phone is not use Nokia brand anymore.

What is Advantage of MICROSOFT LUMIA 640 LTE (DUAL) Specifications:

LCD 5 inches touchscreen with Gorilla Glass 3
Internal memory 8 GB
External memory 128 GB
Main Camera 8 MP, 3264 x 2448 pixels, autofocus, LED flash
Front camera for Video conference 1 MP
Processor Quad-core 1.2 GHz Cortex-A7
GPU Adreno 305
Operating system Microsoft Windows Phone 8.1
Battery Li-Po 2500 mAh

How to Fix or Problem Solving for Recovery MICROSOFT LUMIA 640 LTE (DUAL) hang or not responding or malfunctions or stuck or freezing or bricked ?

When the first time we activate this phone out from the box, we have to sign in for Microsoft account to synchronize our data including contact and several others. By default we will get several ready to use applications, but we still can download some other more from Windows Apps Store like Facebook, Instagram, Whatsapp, Skype, Blackberry Messenger (BBM), Line Messenger, WeChat and many more. But we have to know, some applications sometime can get trouble and make our MICROSOFT LUMIA 640 LTE become hang or stuck or bricks or frozen or boot logo loops. Sometime our LCD touch screen not responding when we run applications. At this bad situations, we need to force soft reset or force shutdown to clean up temporary files and caches. Also reboot will restart all running applications from beginning. If this problems still happen after doing soft reset, then we have to do hard reset or master format. Please remember, doing hard reset or master format will remove or wipe all important data and pictures and videos from this phone. Therefore we have to do backup all important data before doing hard reset.

How to Force Shutdown or Force Soft Reset or Reboot or Restart MICROSOFT LUMIA 640 LTE (DUAL) ?

When we get trouble with the applications our phone become crash or hang or stuck or LCD touch screen not responsive in the middle of running applications. We need to force soft reset or force shutdown to remove cache and temporary files. Good news for MICROSOFT LUMIA 640 LTE because the battery is removable, so we can force shutdown or soft reset by remove or release the battery after open back case cover, wait about 5 seconds until power totally lost from this phone, then put again the battery at right positions, after that press POWER button again to turn it on. Do not worry to do this process, because soft reset will not erase any important data.

We can do this shutdown process when our phone still not get trouble for clean up the temporary files or cache or to refresh the running applications. Please Press and hold POWER BUTTON for several second until the phone shutdown by itself, if you see ‘slide down to power of‘, do slide the icon at this phone then MICROSOFT LUMIA 640 LTE will turn off. We need to press Power button again to turn on MICROSOFT LUMIA 640 LTE again.

How to Master Reset MICROSOFT LUMIA 640 LTE (DUAL) to Factory Default ?

After doing soft reset, maybe our smartphone still have problem or act not normal. Some problem can make the operating system damage and need to be fix by doing hard reset or master format. Please follow this several option step bellow:

#Option 1, How to Hard Reset MICROSOFT LUMIA 640 LTE (DUAL) with Setting Menu:

Please remember to backup your important data before doing the hard reset to factory default, because all data and installed applications will be erased.

  1. Turn on the MICROSOFT LUMIA 640 LTE
  2. Make sure the battery is fully charge or not empty
  3. Go to menu:Setting > About > Reset Your Phone
  4. The process of formatting MICROSOFT LUMIA 640 LTE will do by it self

hard reset microsoft lumia 640 lte

#Option 2, How to Hard Reset MICROSOFT LUMIA 640 LTE (DUAL) with Hardware Button Key:

Now we have other option to hard reset or format MICROSOFT LUMIA 640 LTE with hardware key button especially when the phone stuck or can not access to menu :


  1. Please remember, we have to do two BIG STEP, do it step by step
  2. Turn off the MICROSOFT LUMIA 640 LTE
  3. BIG STEP ONE (a). Press and Hold thePower Button, do not release until the phone vibrate (if you feel the vibrate in MICROSOFT LUMIA 640 LTE then release thePower Button)
  4. BIG STEP ONE (b). Press and Hold theVolume Down Button, do not release until the LCD show the exclamation mark (if you see the exclamation mark in LCD, then release theVolume Down Button)

B. BIG STEP TWO(this can be done after all BIG STEP ONE finish)

  1. To continue reset, you have to do the last step bellow
  2. PressVolume Up Button Keyand release
  3. PressVolume Down Button Keyand release
  4. PressPower Button Keyand release
  5. PressVolume Down Button Keyand release
  6. The MICROSOFT LUMIA 640 LTE will do the hard reset format, wait about three until five minutes. While waiting you will see the gear appear until it finish.

Please remember, you have to follow the step From BIG STEP A until BIG STEP B by sequence.

How to Restore and Reinstall Clean Factory Default Windows Phone 8.1 operating system / firmware at MICROSOFT LUMIA 640 LTE (DUAL) ? (Reformat)

MICROSOFT LUMIA 640 LTE have 8 GB internal memory. Please note, this is not free capacity that we will get when use this phone, because 8 GB is total all internal memory storage capacity, but this space also located for installed operating system and factory default applications, also file source of Windows Phone 8.1 operating system (before upgrade). Therefore, if in some other time when we think our MICROSOFT LUMIA 640 LTE operating system damage or corrupt, then we can reformat or reinstall or restore with clean factory default Android operating system or firmware that already saved safely inside internal memory or ROM. Can we accidentally remove that file source? As far as we use it normally, we can not access the file source of operating system inside MICROSOFT LUMIA 640 LTE ROM. How to reformat or reinstall the OS? Just follow simple steps to hard reset above, then clean factory default Android operating system will be reinstall automatically.

How to Unlock or Fix or Bypass or Solutions for MICROSOFT LUMIA 640 LTE (DUAL) forgot password code or security lock screen or pin (lost password)?

When we use this phone for months, then we will have some important and confidential data or photo or movie/video at internal memory or external memory. We recommended for MICROSOFT LUMIA 640 LTE give security protections to prevent non authorized users see our important data or when phone stolen or lost. We can choose security protections options from software menu. But when we forget security protection of MICROSOFT LUMIA 640 LTE, then we can not bypass easily. We should reformat or hard reset MICROSOFT LUMIA 640 LTE to bypass or unlock forgotten security protection or password pin, and unfortunately all data will be remove or wipe as well.

How to Improve Performance MICROSOFT LUMIA 640 LTE (DUAL) to make run more faster?

Let see the processor specifications, MICROSOFT LUMIA 640 LTE using Quad Core processor with 1.2 Ghz clock speed, of course this phone will run faster for most applications. But why MICROSOFT LUMIA 640 LTE become slowly? Usually this problems happen because there are too many applications run in the background and can make RAM and processor resources insufficient. Therefore we have to remove or uninstall some not use applications. Some bad applications or crash applications also can make this phone run slowly. If we want to make MICROSOFT LUMIA 640 LTE performance run faster again like new, then please consider to do hard reset.

What is the Secret Code Key for Hard Reset MICROSOFT LUMIA 640 LTE (DUAL) ?

There is no secret code for doing hard reset or master format MICROSOFT LUMIA 640 LTE. Just follow the step above to hard reset is the easy way to do.

24 thoughts on “How to Easily Master Format MICROSOFT LUMIA 640 LTE (DUAL) with Safety Hard Reset?”

  1. Hello’ I bought a Nokia lumin 640 from an individual, and I did a hard reset just like you told me to do….then it came back on and I started to enter my information…then it wouldn’t accept my Microsoft account…in order for me to use the phone, I have to put in a reset protection code I don’t have…..I checked theimei number and its not a stolen phone…I guess its what you call bricked…I called Microsoft and them people wanted to charge me 99.99 to fix a year worth of trouble….that is all part of Microsoft scam technitions? there anything anyone can do for me without costing me lots of money I DONT have….please help me….I have 7 different phones and none of the, work…..

    • Hi, maybe something happen with your Microsoft account. Please try to login at Microsoft website just to make sure your login alright and can work normally. The second alternative is try to create new account from your Microsoft Lumia 640 and try to use it again at your phone.

  2. hello i keep trying to reset my phone but everytime i hold the volume button down, my phone keeps on flashing the logo sign and vibrating, just as it would when you start up the phone.

    help how do reset my phone i am unable to use soft reset.

    • Hi, this steps to reformat or hard reset Microsoft Lumia 640 are correct, therefore please make sure you follow the steps carefully and the hardware button should working normally, otherwise the hard reset process can not happen using hardware button.

  3. Thank u very very very very very very very very very very very very very very very very very very very very much much much much much much much much much much much much much thanks to all of you of this website

  4. My phone just freezed, i can receive call but cant answer cos it doesnt ring or even vibrate, its jus blank yet lumia phone is inbuilt battery. how do i resolve this

    • Hi, there are two possibilities. One your Microsoft Lumia 640 LCD screen getting trouble, but if you ever see anything when reboot then hopefully your LCD hardware are fine. Then the second possibilities is doing hard reset using hardware button combination key like steps at #option 2 above carefully.

  5. Hey I have a question for you. I just bought a Microsoft Lumia 640 and I turned it on once then I went to update it to Windows 10 it worked but when I turned it off it went to the two gears screen got halfway done then a sad smiley pops up I didn’t even get to activate it and my phone company i bought it from says I have to have a phone number for them to help me. What can I do I tried everything you said step by step and it won’t work. also my boyfriend tried it did the same thing. Please help me I really need a phone.

    • Hi, usually after finish upgrade the firmware, some old setting or previous installed apps will not work properly with new operating system version, therefore we suggest to do hard reset. At your case, you need to do hard reset using hardware button combination key. However, if still not work, then please consult with Nokia / Microsoft authorize service center to check other problems at your Nokia Lumia 640.

    • Hi, we are not sure about what you ask, but please follow steps at #option 2 above to hard reset your Microsoft Lumia 640 using hardware button combination key. This process will reformat your Lumia 640 operating system to factory default, then after the process finish, you should setup again your phone like beginning.

  6. I have Lumia 640, I decided a hard reset. When I initiated the hard reset on the device through the settings menu I received an error message stating that it could not deactivate reset protection, reset protection was turned off for the device, so I went ahead with the hard reset. Unfortunately, the hard reset worked but reset protection is still on and I can’t deactivate it, by signing in with my Microsoft Account or by using the recovery key. When I try to sign in on the device to deactivate Reset Protection I get the same error message as before the hard reset, that there was an error deactivating the reset protection. When I try to use the recovery key, I type it in and hit “next” and the button just goes gray without any indication that anything is happening. I’ve left it in that state for quite some time (minutes, not yet hours) but haven’t seen anything happen. Is there something else that can be done for this phone remotely? Thanks

    • Hi, first nothing so far you can do for fix remotely. The steps that you have done is right. So it usually your phone after finish hard reset will process reformat and reinstall the operating system to factory default. Your phone will act like new. However, if the problems still happen at your Microsoft Lumia 640, then please consult to Nokia / Microsoft authorized service center for further help.

  7. Hi guys. I bought the Lumia 640 on eBay.
    comes with Reset Protection Active.
    I did the Hard Reset process.
    Still ask for RPK…
    Don’t have info about the previous owner, So I don’t know how to make this Device works!!!
    Any other ideas?


    • Hi, the steps above can work for most standard Microsoft Lumia 640. We are not sure fFor non standard or comes with Reset Protection option at your phone. Maybe you can consult with nearest Nokia / Microsoft authorized service center at your location.

  8. hi I bought a new lumia 640 and soon upgraded to Windows 10. shortly after, I did a hard reset when I wanted to give it away but it’s been asking for a five digit recovery code which I don’t have. I have checked under devices using the same account but the device is not there. how do I get the phone working again. Thanks in advance

    • Hi, if you want to reformat or hard reset Microsoft Lumia 640 without password or without ask security protections then please try to use steps at #option 2 above.

  9. Hi so I bought this lumina 640 Microsoft phone from my friend a while back and I have not idea about the recovery key or the account she’s used for this phone. I don’t think she’ll remember either . I already reseted the phone and I can’t get back in it till I know the recovery key or account. What if I don’t know it . What can I do ? I’m really trying to get back to this phone . Please help

    • Hi, usually your problems can be fix after finish doing hard reset with hardware button combination key like steps at #option 2 above. It will reformat or hard reset your Microsoft Lumia 640 operating system without ask password authentication.

  10. I read all of the above and I have bought that stupid cellphone and I noticed it freezed on me!So I rest it but in the end asked me for RPK which I never got it from MS!so it is remained unworkable! I tried all tricks possible and can’t get through!
    I’m sure MS is a fraud and did it to everyone of us!
    Those charity works are just a tax fraud too!
    So pissed off with it.

  11. Hey so I’m trying to do the hard reset using hardware keys but I accidentally hit the the volume keys in the wrong order. Now my screen just has the lightning symbol on the screen please help is there any way I can start over

    • Hi, can you try to turn off this phone by press POWER button until this phone off by itself? Then you can try again performing hardware button combination key from beginning.

  12. Hi, I bought a Lumia 640 Dual phone from a friend. I have tried to soft reset and hard reset it but it’s just going back to the same old account. What can I do? Please help

    • Hi, perhaps this problems happen because security Reset Protection (at Android known as FRP). Your Microsoft Lumia 640 have facility for protect your phone from hard reset by someone without asking you. This situation happen because your phone lost or stolen. We call it Reset Protection from Security menu setting. If you have done with activate Reset Protection, then you will have to use your answer for bypass reset protection recovery key at your Lumia 640 phone.


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