Check the SD card lock switch and slide it to the unlocked position
Remove and reinsert the SD card
Try the SD card in another device or card reader
Clean the SD card contacts gently with a dry, soft cloth
On Windows, open Command Prompt as administrator and run `diskpart`
In `diskpart`, run `list disk`
In `diskpart`, run `select disk X`
In `diskpart`, run `attributes disk clear readonly`
In `diskpart`, run `exit`
Open Registry Editor and check `WriteProtect` under `HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlStorageDevicePolicies`
Set `WriteProtect` to `0`
In Disk Management, delete partitions and recreate the volume if needed
Format the SD card using File Explorer or Disk Management
On Mac, open Disk Utility and erase the SD card
On Linux, use `lsblk` to identify the SD card
On Linux, use `sudo hdparm -r0 /dev/sdX`
On Linux, remount the card with write access if it was mounted read-only
Scan the SD card for errors or bad sectors
Update the SD card reader drivers
Update the device firmware if the card is used in a camera or phone
Check whether the SD card has reached the end of its write cycles
Replace the SD card if it remains permanently write-protected