Ok before you are the first person to tell me to RTFM I read the god damn manual this is after a lot of trial and error.
So I bricked my Proxmark3 Easy, this is fine, I read on using the Raspberry Pi as a Jtag programmer, I read on this forum how to fix it and I followed it to a T 7 to 8 times, and every time I get this weird thing where it appears to have worked and installed the new firmware but it never shows up on any of my computers Thinkpad P50 (Ubuntu), Manjaro Linux (Ryzen Desktop), and my Raspberry Pi, and whenever I use DMESG it does not show. Does anyone have any tips or tricks that I can use?
[17012.399175] usb 1-4: Product: proxmark3
[17012.399177] usb 1-4: Manufacturer: proxmark.org
[17012.399179] usb 1-4: SerialNumber: iceman
[17012.984340] cdc_acm 1-4:1.0: ttyACM0: USB ACM device
[17012.986305] usbcore: registered new interface driver cdc_acm
[17012.986309] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
Hi everyone, it’s been awhile since I’ve had the time to play with my Proxmark3, but I was working on it earlier. I have the Proxmark3 from DT and I had followed the full instructions for running the Iceman software and everything. The problem I am having is on HF reads I am getting nothing, as if there is no tag visible to the Proxmark, and LF reads give me communication errors. This is running on a Windows 10 computer and the Com port between the computer and Proxmark is COM6. I have included a screenshot of both reads being tried with known good tags sitting directly on the respective antennas of the Proxmark. I suspect some kind of communication error is occurring between the Proxmark and the computer. The LF side consistently gives me that Graphbuffer error on the first try and then the communication error on the second try. I am just curious if anyone else has ran into anything like this and if anyone has any suggestions on what to do. Possiblity it’s just something right before my eyes that I am missing, but any help is greatly appreciated thanks
So far both an HID formatted card and an EM4100 formatted T5577 card on the LF side, and a card that contains a Mifare chip on the HF side. The EM4100 T5577 card registers on my access control system and the Mifare card is easily read with NFC Tools on my phone and on the computer with an ACR reader.
Just out of curiosity. You did not remove the center pcb ? I have found this causes the exact problem you are having when I did it.
Also have you tried on another computer? My windows 10 desktop can do everything but flash a proxmark when it comes to the client. But my laptop is easy peasy no problems.
Thanks everyone for all the help so far, what I did now is try the latest updates, plus another cable, and another computer. I still get the same thing, even says both antennas are unusable when I run hw tune. I got me really curious about that middle board. I haven’t made any physical changes to the Proxmark since I got it. However, here is a picture of the Proxmark as is. I’m not sure if it will help, but this is how it is physically…
That says Dangerous Things to me. In the photo it looks like the side usb port is nearer the top and the button is nearer the HF antenna while on mine the side usb port is between the button and the middle screw. I don’t think that that is relevant but I did find it interesting.
thanks 
