T5577 need to change block 3 and 4

Hi. Tags sold for me as t5577. Need to change block 3 and block 4 but seems to be it cannot be changed :frowning: still all zeros after making changes. what is the problem ?
Tried to wipe but it doesn’t help
Proxmark3 easy

Add/ block zero works fine and can be modified

You should show the lf t55 detect and your writing command result

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Sometimes crappy sellers will sell you t5577 that only have blocks 0-1-2 meaning you can only fit certain encoding formats on them. This seems to be the case with you, I recommend returning them


You mean they are selling a Chinese knock off of a T5577 and not an actual legitimate T5577 :slight_smile:

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