How can I reuse a crowdled bracelet?
I've been trying to modify them too(older model). I have been trying to use a ESP8266 to change the leds so I can make an app for it, however, it didn't work out. This is what I've researched until now: the two IC's is a LED driver and a receiver. The number on the driver doesn't seem to "exist" when you try to search it up. The receiver, however, is a CMT2210LCW.

Somehow, I've managed to switch between modes by mounting a button connecting the GND to one of the pins which I don't remember on the rgb led driver. Measure the pins and lines before trying this out.

The radiocontroller has a data output pin which outputs a demodulated signal. If you're not using it, I suggest you to drive pin 4(SDN) high to disable the receiver. Don't scratch the supply line off yet, since it might come in handy after some more developing. Try to see if the wristband survives longer than a day.

Oh, one more note, I've been doing this on a older model which has a number on the receiver. I don't know for sure if it's the same IC, or if it has the same lay-out.

P.S. I modified the wristband with a concealed button to switch between lighting modes. Sadly, no control via radiowaves yet.