https://youtu.be/RAxHEal0R8I
I have one this kind of china BE key, the circuit board printed KYDZ, its IR signal is very weak and some sync. problem with car, so that's why it fail to read/write then need to try couple times.
Certainly bought directly from cgdi...
they sell such LQ...
has also two of them not working, even new...
but through IR no response...
Look at CG MB BE KEY:
[caption id="attachment_24582" align="alignnone" width="500"]
√All Mercedes Benz till FBS3
√Never lose synchronization
√Automatic Recovery
√Fit 208,203,215,210.220.211.209,164.221.216.166.169.639.204.207.212
√W221 W216 W164 W251 (after 2009), incl. S Series, ML Series, GL Series and R Series.
√Get 200 bonus points for the first time to program this key, 200 points= 1 token ($4)
√No key shell (smart key shell with 3 buttons or smart key shell with 4 buttons)
Enjoy!
http://www.obdexpress.co.uk