BQ28Z610: Security modes and related command

Part Number: BQ28Z610
Hello, In the SLUUA65B, the paragraph 9.5 states about the security keys. Due the is recommended to change the keys, it is important to do that, but there are some point that make confusion in the mind of the reader. 1) the example how to change seems clear, but what are the last sentence at page 47 "For this activity, the 2nd key must be sent within 4 s of sending the first key; otherwise, the request will not be accepted." referring to? 2) same page, the text "Byte0: Unseal Key LSB Byte1: Unseal Key MSB Byte2: Full Access Key LSB Byte3: Full Access Key MSB" is wrong, isn't it? each key is 2 word or 4 bytes, than in total should be 8 bytes, from Byte0 to Byte7. 3) paragraph 9.5.2 (and, similar, .3) "Unsealing is a two-step command performed by writing the first word of the unseal key to AltManufacturerAccess() (MAC), followed by the second word of the unseal key to AltManufacturerAccess()." Then, having the UNSEAL key in the form Byte0 (LSB) Byte3 (MSB), is the following sequence correct? START, Write 0xAA, 0x00, 0x035, 0x00, Byte0, Byte1, STOP - START, write 0xAA, 0x00, 0x35, 0x00, Byte2, Byte3, STOP. And similar for FULL ACCESS, using Byte4 to Byte7.... May anyone help me?