PhreakByte the OctopusJun 4

Updated the #ChameleonUltra #RFID UF2 bootloader, now more simple to flash ;) no 'race timing issue". https://github.com/nieldk/ChameleonUltra/tree/UF2 Read instruction in. https://github.com/nieldk/ChameleonUltra/blob/UF2/firmware/tools/UF2_INSTALL.md

Be aware that you probably will need SWD in case you want to revert to 'normal'

GitHub - nieldk/ChameleonUltra at UF2

The new generation chameleon based on NRF52840 makes the performance of card emulation more stable. And gave the chameleon the ability to read, write, and decrypt cards. - nieldk/ChameleonUltra

GitHub
PhreakByte the OctopusMay 19

Once again, i did the #impossible 😉

Flashed #bootloader (UF2) to #ChameleonUltra

Everything is here ** WARNING! ** You will likely brick your device, but this branch contains also the tools to create a UF2 rescue app!

https://github.com/nieldk/ChameleonUltra/tree/UF2

[email protected]:~$ Jan 31

I couldn't resist! Say hello to my little RF hacking toy. Took out this Christmas gift for a test spin today, and it worked like a charm.

#RF #hacking #pentesting #chameleonultra #NFC #RFID #gadgets

Stefan Wolfrum Nov 3, 2025
Not quite sure what I‘m doing (yet) 🙈 but it’s a fascinating learning journey! #rfid #nfc #hacking #ChameleonUltra #MToolsBLE
Stefan Wolfrum Oct 31, 2025
Finally! My Chameleon Ultra arrived! 🤓 It‘s smaller than I thought; AAA battery for reference in the image. #rfid #nfc #electronics #chameleonultra (But it’s a cheap China clone! 🙈 Now let’s see what it actually can do!) #hacking #whitehat
turbocoolerJun 7, 2024
Some progress with ultralight support on #chameleonultra. I’ll likely merge ultralight and ntag implementations due to their similarities
turbocoolerJun 5, 2024
Finally got this little #chameleonultra devkit two days ago and it already runs a custom firmware. Trying to add Ultralight support before making an attempt with DESFire (it’s kind of supported already, but it’s actually NTAG and a lot of things are unimplemented)
turbocoolerMay 30, 2024
Wow, using the new #chameleonultra feels so satisfying. It just works as if you had a real card, you don’t have to press any buttons. This is very different from the tiny version which had stability issues. Also 125khz support comes as a cherry at the top
Bruce "grymoire" Barnett Aug 25, 2023
I just realized that if I hold down the A button on my #chameleonultra I can connect it to the Android app over bluetooth. Wow! Thanks! @herrmann1001 and team
derPUPEAug 25, 2023
what a tiny little beauty #ChameleonUltra