Windows 10 mobile How to decrypt a microSD card after a factory reset of the device used to encrypt

[tom smiley]

I have a problem and I know very soon most guys will have it too.

I'm on the insider slow ring and I activated the sd card encryption and later
updated the mobile os to the latest version which is Windows 10 Build 15063. I later realized some of my apps were running very slow so i did a hard reset. Now everything is working perfectly but my phone (Lumia 640XL Dual sim) can't open the encrypted sd card even though i encrypted it with the same phone.

 

[mtf1380]

I think the screenshot below is what happened to you (attached for others to be aware!!!!).

I don't know if you can retrieve your info (check OneDrive for back-ups), you can go to this page on your phone (Settings > Update & Security > Device encryption), and follow the 'Get Help' link to see what you can do.

Good Luck!

 

[greedo_greedy]

So basically, when you turn encryption on, it ties the SD Card to your phone.
If you want to unencrypt it, all you have to do is simply turn it off.

Is it really that simple?

 

[anon(10197358)]

@greedo_greedy

When you do a hardware reset or Windows image flash and that SD card encryption is enabled when that's do, this SD card doesn't anymore recognized by Windows.

 

[beachhoppr]

This just happened to me as well. Hopefully you get a resolution. Do you know if it can even be reformatted

 

[Withheld]

**Warning this will erase all contents!

Run Command Prompt as Administrator

>DiskPart
>List Disk
>Select Disk x (x=the drive number you wish to format/fix)
>Attributes Disk Clear ReadOnly
>Clean
>Exit

Now go in to Disk Manager and you should be able to see the drive and format it.