Illegal clones can easily be deciphered:

1. Original Flyduino KISS FCs are NOT being sold legally on Taobao or Aliexpress. Some resellers offer the originals on Ebay or Amazon but most of the others are also fakes, so keep your eyes open
2. Clones often come with pre-tinned pads (RX, TX, SDA, SCL), originals do not
3. Clones have a yellow boot button, originals have grey ones
4. Clones are missing the name “F.Niessen” on the silk screen
5. Clones are missing a legal serial number so they can’t be activated
6. Some clone sellers mention the fact that only Betaflight runs on them