There's a Decrypt option. Go to Settings → Security → Encryption, there's a "Decrypt Device" and "Decrypt SD Card" option. After you select "Decrypt SD Card", just uncheck all the boxes on the next screen (see screenshot below). (Click image to enlarge)
Encrypt Files on Your SD Card Using Your Android Phone Unfortunately, it is virtually impossible to access or decrypt the files on your SD card without the right password. Android's encryption algorithm is based on two major factors - the mobile device and the password. Lose any of these, and your encrypted SD card files will be inaccessible. how to Encrypt and Decrypt SD Card and smart phone Data Aug 24, 2018
Here are common simple steps for you to follow:Step1. Open Setting option of your android phone.Step2. Select Security option under Settings interface.Step3. Click Encrypt external SD card there.Step4. Disable Encryption there by following its guide.Step5. Reboot your android phone at last.
I've encrypted my SD card on my old mobile, now I can't
Oct 10, 2018
How to decrypt files from Android/USB? Dec 25, 2016 Solved: Galaxy s7 decrypt sd card - Page 2 - Samsung