Are you quint256 on the discord? I shared the raw commands that would factory reset your sector 0 user data (pages 04-E1) on there just in case you had some vestigial NDEF message header that was messing with the read. The next step was to check your config bytes. Scorp was nice enough to share his xSIID’s config info.
For future reference the raw commands you can use in NFC Shell or NFC Tools Advanced Commands are:
Read: 30
Write: A2
so to read the UID you would send:
3000
and then
3001
to write 01 02 03 04 hex bytes to page 04 you would send:
A20401020304
You want your config bytes to look like these, and you want all your user space to be full of 00 bytes
