and when I try to test 100x by putting my finger... I have Add user result: 0 but the chance is 1/100. So could it be the fingerprint unit is broken? User added successfully! RxBuf[0]: F5 RxBuf[1]: 3 RxBuf[2]: 0 RxBuf[3]: 0 RxBuf[4]: 0 RxBuf[5]: 0 RxBuf[6]: 3 RxBuf[7]: F5 RxBuf[8]: 0 1