Xavier Averbouch

@DavidBerdik unfortunaltely, I don't know how to go further now, and libnfc project team (@neomilium , @doegox , @darconeous ) doesn't seem to be available .. I've posted this issue...

@DavidBerdik Hi , I tried to use darkside attack with proxmark 3 on tag with your hotel tag dump but : 

@DavidBerdik mfoc hardnested (windows version) works well (as some keys are default keys) and quickly finds all keys on acr-122u (- 30 seconds)   with proxmark3 it works well...

@Cazs03 unfortunately, no, and libnfc team doesn't seem to work on this project these days...

@DavidBerdik it took also weeks for me to receive it from AliExpress China

@Cazs03 when you write your dump to the card, if your dump changes ACs (Access conditions) you can "brick" some sectors of the card: depending on the ACs values, you...

> .\nfc-mfclassic.exe W b .\destination.mfd .\backup.mfd @Cazs03 did you also try with key A? .\nfc-mfclassic.exe W a .\destination.mfd .\backup.mfd

> @xavave I have two new original cards, they are not Chinese cards and I cannot use the capital W. > I will try again to see ... I am...

> @xavave Could you point me in the right direction for testing with a proxmark? I cannot even get the `hf` command to work in my ProxSpace environment. > >...

I've emulated a MIFARE SMART 4K tag using command proxmark3> hf mf sim *4 u 1FCE788E then I've put my ACR122U on the proxmark and ran mfoc in debug mode...