Hi, i have here a photo that will show you on how to remove write protect on a micro SD.
1. You need to insert your micro SD into an adapter. 2. Unlock the micro SD through your adapter as shown below. 3. Once done, your micro SD is no longer write protected. 
NOTE: The lock switch doesn't lock the micro SD into the adapter; The lock switch doesn't lock the data on the micro SD; The lock switch simply tells the "user" not to write. It just says "please, don't write me."
SOURCE: My Micro SD Card No.- Kingston 2GB micro SD Card
My Kingston Micro sd-c02G is Locked i want unlock password
SOURCE: micro sd card is locked
Hello,
For the microSD card you'll need the large adapter (picture left side)
to unlock.
Insert the microSD card into the Adapter with the arrow upwards:
put the microSD card directly into the Adapter on the left.
(The Adapter on the right below is miniSD, used for other size cardreader slots)
1. Slide the switch up and down. Repeat this 3 times.
2. Let it stay on the Lock position for 30 seconds.
3. Slide the switch up to unlock the card.
4. Try to put data onto the SD card (Adapter) with the microSD card in,
on the SD card reader slot of your computer
or
Pull out the microSD card and put it in your previous used device, to
see if transferring files will work.
SOURCE: my mobile memory card has been locked i want to
cannot read for psp memory stick pro duo 4gb
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