I have seen the ones that sell no limitation sell the kess with the programmer jlink jtag. reading on the website of a vendor, you must solder on kess a comb and connect it to the jlink, they give you a file and a program to use with the jlink to reset the token without desoldering the micro.
at least I understood it so?
instead, for the ktag after 500 scriptures throw it and buy another, his work has done and should retire