Hey, I am also new to the space, with that being said take what I say with a grain of salt. Firstly the passcode is set to prevent malicious or accidental writes from being performed, as long as you use the same cloner this should give you no problems. However in some cases the passcode may become corrupted due to “tearing”, in such instances the passcode is changed, and there is know way to know what the new code may have been set to. This would result in the transponder becoming read only, unless you are able to brute force the passcode. Regarding The cloner, it has been removed off of the store due to the possibility of it “bricking” the implant. This is not the cloners fault, but rather could occur between any T5577 based tag, meaning that the possibility of this happening exists while using almost any cloner. In the event that the tag becomes unresponsive upon the use of the cloner, a proxmark3 is needed to resolve the issue.
More information regarding cloning xEM can be found here:
Keep in mind, when purchasing a cloner they may all look identical, but may be very different in terms of their functionality. There are many versions of the blue cloner all of which may not support the same card styles. Since the cloner has been removed fro the dangerous things store I have found another that appears to be similar:
The cloners passcode can be found here:
https://dangerousthings.com/shop/xem-cloner/
As I previously stated I as well am new to the space, if any misinformation is found be sure to let me know thanks. Furthermore Amal will probably give you a better answer once he has seen the post. Hope this helped!