In order to restore the stock firmware on a TP-Link WR740N v4, TP-Link WA901ND v3 or other TP-Link Wi-Fi Router or Access Point, previously WIFIMU Firmware, you have to follow these steps:

MAC / LINUX USERS

  1. Get the stock firmware in the TP-Link website www.tp-link.com
  2. Download of the stock firmware from your laptop to the Access Point using WGET original.bin from the laptop placed FTP folder into the /tmp/ folder within the device
  3. Remove the boot descriptor from the firmware using the command dd
    dd if=original.bin of=originalok.bin skip=257 bs=512
  4. NOTE: be careful during this operation, as if not correctly performed you risk to brick the boot.
  5. Remove the original file (in order to free space) with command
    rm original.bin
  6. Flash with command:
    mtd -r write originalok.bin firmware

WINDOWS USERS

  1. Download Putty and PSCP from here:
    http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
  2. Download the stock firmware from the TP-Link website: www.tp-link.com
  3. Rename the TP-Link firmware that you just downloaded to original.bin
  4. Connect your computer with ethernet cable to LAN port
  5. Copy PSCP and original.bin to the same folder on the computer that is being used to restore the stock firmware
  6. Open a Command Prompt
  7. Perform a ping to the IP_ADDR of the AP to verify that you can reach it.
    The default IP_ADDR of the AP will be 10.13.3.254 only if you haven’t changed its configuration.
    If there is a DHCP server in the LAN, you’ll have to check the DHCP lease table to know which is the IP_ADDR of the AP.
    In such case you’ll have to configure your laptop with the following IP: 10.13.0.1 / subnet mask: 255.255.252.0.
  8. Transfer the original firmware file to the AP into the /tmp/ folder with the following command (replace IP_ADDR with the IP address of the AP you want to flash back to stock firmware):
     pscp -scp original.bin root@IP_ADDR:/tmp/

    when prompted, enter password: admin

  9. SSH into the AP using Putty. See the username and password below.
     cd /tmp
     dd if=original.bin of=originalok.bin skip=257 bs=512
  10. Note: Be careful during this operation, if not correctly performed you risk to brick the boot.
  11. Remove the original file (in order to free space) with command:
     rm original.bin
  12. Flash with command:
     mtd -r write originalok.bin firmware

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