By checking if the configuration data (page 0, block 0) has some settings that must be the same. think reserved 7bits, This is a trail and error approach.
But together with setting a manual configuration to read a tag and this automatic verification it will help out alot I think.
Fix: removed a call to free, which I think made linux people unhappy during "lf t55xx rd 0"...
Add: "lf t55xx fsk" now kind of outputs binary from "FSK2a R/40 R/50"..