barcode issue

[imaginepros]

hello, im using tagtinker on a tembed c1101 plus with flipper firmware. the place to enter the barcode in targeted payloads wont let me change the first charactrer to a 0, it is forced to be a letter but i dont want it to be/

[CaitSith2]

If you are trying to use the barcode shown on the display itself, that number does not match what the barcode actually encodes. The barcode human readable information is actually on the back of the tag itself..

Front of a tag when its displaying its barcode diagnostic page. The human readable text underneath this barcode doesn't actually match what the barcode itself decodes to.

Back of the tag. This is the barcode you want, the one that starts with a letter, and is 17 characters long.

Also note that the tag should have branding similar to this example, as tagtinker only supports this specific brand of tags.

[BG3Z]

Could you write into your F15 tag ? (the one you show on the image) I have the same one but cant write on it