See in page E3 the AUTH0 byte is set to 04? That means the entire user memory from page 04 down are under the protection of the password feature. Something somewhere changed the AUTH0 byte in page E3. It just means you will have to authenticate first in order to write changes to the user memory. Probably the best way around it would be to reset the password to factory FF FF FF FF. Depending on the batch the default password will be DNGR or NExT. From the product page; Because of this, we set a default password value of 0x44 0x4E 0x47 0x52 which is ASCII code for DNGR (some older batches of NExT chips have the password 0x4E 0x45 0x78 0x54 which is the ASCII code for NExT).
