]]>hi
I have a da vinci 1.0, follow the instructions in the pdf to install the xYZware Pro e, but it does not update the firmware, download to try your luck the zip xyzdav_f11_upgrade.zip but it has a password and you cannot test the bin it contains.
any ideas?
thank you
I'm going to get straight to the point so as not to annoy any of the pro's, and going to ask that whomever answers my question please understand that i am a complete and utter noob when it comes to resetting nfc chips... all i know is that i have a Da vinci mini w+, and that i have quite a bit of 3rd party filament with no nfc chip for my printer to read.
However... i am a quick study, am willing to do the reading and the learning and am fully capable of learning.
I need, and am requesting some sort of README intruction that will guide me step-by-step in using the hacks you guys have provided in order to reset my printers filament count.
PLEASE HELP?
Thank you for understanding and i look forward to learning and growing with this forum.
I am from Johannesburg, South Africa... so this type of technology is SO SUPER NEW to the country that there really isno other help resource i can dig into to help me with this problem.
Thank you so much,
Kind Regards,
ReazonzImAm
]]>]]>Hi everyone,
I am a newbie, so I need a total help on this. I have a DaVinci Jr and my NFC Tag went to 0 filament before actually consuming all the filament. So, I need to reset the filament length. Should I buy a new paper tag? Where can I Fin the UID and what exactly should I do then?
Sorry for the annoying questions.
You can refill the tag you have - but your printer will not accept it as it remembers each tag and the last length it saw.
You need a new (paper) tag to and read it to get the iD.
The ID is the first 7 bytes.
All 4 from the first page
then the first 3 from the next page.
The ID will be unique to that tag.
]]>I am a newbie, so I need a total help on this. I have a DaVinci Jr and my NFC Tag went to 0 filament before actually consuming all the filament. So, I need to reset the filament length. Should I buy a new paper tag? Where can I Fin the UID and what exactly should I do then?
Sorry for the annoying questions.
]]>I have an XYZ 2.0 DUO printer. Due to the encryption of xyz consumables, I cannot use open source consumables. Can your NFC key software crack the chip of consumables?
thanks！
]]>I bought a new printer and will soon be leaving this great community.
I'm giving my da Vinci miniMaker Special Edition away to anyone who wants it. It comes soldered with JTAG access port from my hacking sessions.
I live in Sweden and I prefer not having to ship it outside Europe, if possible.I will of course keep nfckey.xyz online for the years to come.
I would love to take care of it! I live in Sweden 
I will of course keep nfckey.xyz online for the years to come.
]]>Maybe they used a simple key for the firmware encryption as well?
No they don't. I have figured out the private AES 256Bit Key. It's per "Type Key" and stored packed or scrambled in the firmware.
So each printer type have same key. (At this point crossflashing is not possible with original encryption firmware).
But downgrading is now possible at any time.
I don't know if I can post more about this here?!?
]]>Maybe they used a simple key for the firmware encryption as well?
nilezon wrote:Good find!
I did see a key expansion algorithm but I didn't bother to "decode" it.
Also, I did see some unreachable code in the key/pack assembler, so I figured they used some standard algorithm, but I didn't understand it was RC5. Instead I tried to simplify the code as much as possible, removing the unused code and using the expanded integers.Hi nilezon,
Just for the record. ;-) Finally I can confirm that the the PASS and PACK generation use RC5 enryption with the key "915F4619BE41B2516355A50110A9CE91"
One thing I down understand, why they used that good know Key??
If you google for it, you will find a lot hits.so in C# I do it like this:
private static byte[] Magic_RC5_Key = { 0x91, 0x5F, 0x46, 0x19, 0xBE, 0x41, 0xB2, 0x51, 0x63, 0x55, 0xA5, 0x01, 0x10, 0xA9, 0xCE, 0x91 }; static InitNfcKey() { // initialization with our key CryptoRC5.RC5Engine.RC5_Init(Magic_RC5_Key); } public static Byte[] GetPASS(Byte[] uid) { // Buffer for rotated UID byte[] buffer_In = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; //-- Part 1 -------------------------------------// // calculate rotation offset int rot_offset = ((uid[1] + uid[3] + uid[5]) & 7); // rotate the UID for (uint i = 0; i < 7; i++) buffer_In[(i + rot_offset) & 7] = uid[i]; //-- Part 2 -------------------------------------// // call RC5 Encryption byte[] buffer_Out = CryptoRC5.RC5Engine.RC5_Encrypt(buffer_In); //-- Part 3 -------------------------------------// //Calc PASS long PASS = 0; //Key as int // calculate rotation offset rot_offset = ((buffer_Out[0] + buffer_Out[2] + buffer_Out[4] + buffer_Out[6]) & 3); for (uint i = 0; i < 4; i++) PASS = (buffer_Out[i + rot_offset] & 0xFF) + (PASS << 8); return BitConverter.GetBytes(PASS); } public static Byte[] GetPack(Byte[] uid) { // Buffer for rotated UID byte[] buffer_In = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; //-- Part 1 -------------------------------------// // calculate rotation offset int rot_offset = ((uid[2] + uid[5]) & 7); // rotate the UID for (uint i = 0; i < 7; i++) buffer_In[(i + rot_offset) & 7] = uid[i]; //-- Part 2 -------------------------------------// // call RC5 Encryption byte[] buffer_Out = CryptoRC5.RC5Engine.RC5_Encrypt(buffer_In); //-- Part 3 -------------------------------------// //Calc PACK long PACK = 0; for (uint i = 0; i < 8; i++) PACK = ((buffer_Out[i] & 0xFF) * 13) + PACK; Byte[] packBytes = BitConverter.GetBytes((PACK & 0xFFFF) ^ 0x5555); return (new Byte[2] { packBytes[0], packBytes[1] }); }