SD Card Toolbox. Lock unlock with password. CID reading and more…

SD Card Toolbox. Lock unlock with password. CID reading and more…

Reading SD card CID number was cumbersome and inconvenient process which took more time than it should, especially for the Windows users. Not to mention locking and unlocking SD card with password, it was impossible on the Windows operating system at all.

We believe that this process should not be so tricky and inconvenient so we have created small handy device for tasks with a SD card security features and called it SD Toolbox. As this has been a great success among the users, we understand the importance of the device and are constantly updating it and offering new features.

So let’s dive into the opportunities it offers…

Main features

  • SD, SDHC & SDXC cards supported
  • Read SD card type and size
  • Read & Decode SD card CID number
  • Decode CID number without SD card
  • Read & Decode CSD number
  • Lock & Unlock card with password*
  • Set/Remove temporary write protection
  • FAT32/exFAT partition hiding
  • Erase card and remove all protections

* unfortunately it doesn’t extract unknow passwords from SD card. Password must be known in order to unlock SD card

Because this device has gained success mainly among car electronics enthusiasts and professionals we have added some optional features especially for them

Optional features

Unlocking/Locking fixed password cards:
  • Mitsubishi MMCS (Navi model: NR242xx (W11, W12, W13, W15, W17, E11, E12 ))
  • Mitsubishi NR-MZxx (Navi model: NR-MZxx. Used in Mitsubishi, Mazda, Nissan Note)
  • Peugeot/Citroen MMCS (Peugeot 4008, Citroen C4 AirCross (P11, P12, C11, C12))
  • Lexus/Toyota gen.8/9 microSD (MAP) and internal SDHC (boot) (Lexus ES, GS, GX, IS, LS, LX, NX, RX, RC, RC-F from 2015, Toyota Land Cruiser 200 from 2015)
  • Toyota/Lexus/Nissan various models (Toyota Prius PHV 2018, Pioneer CVX-2458 (Lexus RX350 and others), other various models used in Nissan/Toyota/Lexus vehicles)
Online SD card password calculator for VW, Škoda, Seat RNS315 navigation systems from CID number

Indicators and controls

sd toolbox indicators and controls

  1. Menu bar
  2. SD card status indicator. Shows locking and write protection status
  3. SD card type and size
  4. SD card CID number (hex format)
  5. CID decoder
  6. Password field (password size: 1-16 bytes in hex)
  7. Set/Remove password buttons
  8. Set/Clear write protection buttons
  9. Forced erase button

CID decoder

CID decoder is activated by pressing button with question mark next to CID number or from Menu View/CID register.
It can be used as CID decoder without SD card. When SD card is removed, CID field is editable, you can input any CID to decode.

cid decoder

CSD decoder

CSD decoder is activated from Menu View/CSD register

csd register decoder

Locking / unlocking SD card with password

SD card locked with password is protected from any access to SD card data. When locked SD card is inserted to the PC, it is not detected by system at all and no read/write or any other functions are allowed.

  1. insert SD card into device SD slot
  2. SD card will be detected and SD type, CID number and status will be shown
  3. if SD card is locked, status indicator will show red lock, if unlocked green
  4. input 1-16 bytes password in HEX (2-32 symbols) to the password field and press Set to lock or Clear to unlock
  5. if SD card locking is successful, SD status indicator will change lock symbol to red or green

sd card locked   sd card unlocked

Setting / Removing write protection

Write protection is used to protect SD card data from modifying its contents. When write protect is set, SD card inserted into PC reader is read only and can’t be formatted, erased or any new data written.

There are 2 types of WP: temporary and permanent. This device can set or remove temporary WP only, if permanent write protection is set, it cannot be removed anymore. Type of write protection set can be checked within CSD register. There are 2 flags PERM_WRITE_PROTECT and TMP_WRITE_PROTECT

  1. insert SD card into device SD slot
  2. SD card will be detected and SD type, CID number and status will be shown
  3. to set write protection press Set button, to remove write protection press Clear button
  4. SD card write protection status is indicated on SD status indicator


Forced Erase

If SD card is locked with Password and password is unknown, SD card is unusable. It’s possible to remove password protection with Forced Erase function and it will allow to use SD card again. Forced erase clear password, write protection and ERASE ALL DATA on SD card and data from SD card can’t be recovered. So, use it with caution!!!

Menu Items

View – view SD card registers values (CID, CSD)
Mode – Select password mode

Custom password – used for locking and unlocking with any desired password
Toyota/Lexus/Nissan – used for various Toyota/Lexus/Nissan SD locking and unlocking
Mitsubishi – used for Mitsubishi MMCS & NR-MZxx SD card locking and unlocking
Mazda – used for Mazda 3, Mazda CX7 SD locking/unlocking
Citroen/Peugeot – used for Citroen/Peugeot MMCS SD card locking and unlocking

password mode

Tools – optional tools

RNS315 PWD Calculator – online SD card password calculator for VW, Škoda, Seat RNS315 navigation systems from CID number
Hide/Unhide FAT32/exFat partition – hides/unhides partition with Navi data. SD card contents with hidden partition cannot be seen with PC reader, but navigation unit can read such SD*.
*works on most Toyota, some Nissan, Mazda and other Navi units. Detailed Navi list where this feature works constantly updated and customer feedback is very welcome


SD Toolbox installation (v2.4.5)
User Manual (v2.4.5)

Update log

Version 2.3
  • Fixed incidental sw freezing on card change
  • Fixed SDXC support
  • CID register information display in hex added
  • CSD register view & decoder added
  • CID CRC value fixed
  • PC-Tool communication protocol bug-fix
  • display of SD size in Gb next to type added
  • PWD always in lower case for easier readability
Version 2.4.1
  • Added HEX validator for CID input field
  • Fixed WP status for permanent WP
    (now shows WP ON if permanent WP is set)
  • Mitsubishi MMCS SD card locking/unlocking
  • Lexus/Toyota generation 8/9 microSD(MAP) and internal SD (SW) locking/unlocking
  • CID CRC value fixed
Version 2.4.2
  • Added Lexus SD unlocking (Boot SD) for  Pioneer CVX-2458
  • Firmware update bugfix
Version 2.4.3 (2020-10-21)
  • FAT32/exFAT partition hiding
  • minor bug fixes
Version 2.4.5 (2021-03-10)
  • CID decoder – “0x” removed before Hex numbers
  • Mazda DENSO SD locking
  • Mitsubishi NR-MZxx SD locking
  • Toyota/Lexus/Nissan SD locking (new models added)


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