Thanks to all for the assistance. I am glad that my various tests were performed on a 1KGen2 test cards of which one works simply using the Clone UID function. The second card which may have been screwed by trying Gen1 commands on it is in a very confusing state after my various testing.
This second 1KGen2 card can be read by the MCT tool BUT NOT any longer by NXP Taginfo so something is screwed up.
The MCT tag info displays the following data:
UID
– – – – (masked for security but correct 4 byte UID)
RF Technology:
ISO/IEC 14443, Type A
ATQA:
0004
SAK:
98
ATS:
Tag Type and Manufacturer:
MIFARE Classic, Unknown
MIFARE Classic Info
Memory Size:
4096
Block Size:
16 byte
Number of Blocks:
256
It seems that the 1KGen2 card has an incorrect memory size (4K) setting from somewhere.
Is there any way to recover from this and restore the card to default. I have tried the format option in MCT without success.
Thanks Rolf