# Changes for the User NFC Key Dictionary
Official firmware has introduced a user dict file option which will allow you to update firmware and not lose any added NFC keys! This is great, but requires a slight change in the way things were done previously. I've removed all the NFC keys that are in the original `mf_classic_dict.nfc` provided by Official firmware as of July 26, 2022 and converted [what's left over](https://github.com/UberGuidoZ/Flipper/blob/main/NFC/mf_classic_dict/ReadMe.md#older-method-combined-multiple-mf_classic_dictnfc-files) to the new `mf_classic_dict_user.nfc` [file here](https://github.com/UberGuidoZ/Flipper/blob/main/NFC/mf_classic_dict/mf_classic_dict_user.nfc).
To use, add the `mf_classic_dict_user.nfc` file from this repo into the SD Card -> nfc -> assets folder.
No need to overwrite anything or rename anything. Do that and you're done! Now verify the new keys are recognized
Head over to **Flipper -> NFC -> Extra Actions -> Mf Classic Keys** and you should see something like this:
You can add more easily using the center button if you discover more!
## Older method: Combined multiple mf_classic_dict.nfc files:
- [Official firmware](https://github.com/flipperdevices/flipperzero-firmware/blob/dev/assets/resources/nfc/assets/mf_classic_dict.nfc)
- [Unleased firmware](https://github.com/Eng1n33r/flipperzero-firmware/blob/dev/assets/resources/nfc/assets/mf_classic_dict.nfc)
- [MuddledBox firmware](https://github.com/MuddledBox/flipperzero-firmware/blob/dev/assets/resources/nfc/assets/mf_classic_dict.nfc)
Also included all NFC keys from [Proxmark3 Iceman's dictionaries](https://github.com/RfidResearchGroup/proxmark3/tree/master/client/dictionaries) and [RFIDresearchgroup](https://github.com/RfidResearchGroup), as well as random others online, then removed all dupes. This has almost **tripled** the amount of verified keys and been much more successful in capturing all keys in multiple tests during reads.
To use, replace the existing file `mf_classic_dict.nfc` under SD Card -> nfc -> assets.
You can rename the existing as a backup or download it again from the links above if ever needed.
NOTE: This has been merged into [Unleased firmware](https://github.com/Eng1n33r/flipperzero-firmware/commit/9e9b33445f0524d6d6ef4641cfc275731d0936c4) as well as [RogueMaster's firmware](https://github.com/RogueMaster/flipperzero-firmware-wPlugins). Also important...
