The access bits 17 80 FE
decode to C1 = 0x8
, C2 = 0xE
and C3 = 0xF
, so the access bits are:
- (C1 C2 C3)_3 =
1 1 1
- (C1 C2 C3)_2 =
0 1 1
- (C1 C2 C3)_1 =
0 1 1
- (C1 C2 C3)_0 =
0 0 1
Therefore, data block 0 permits read and decrement access with key A & B, data blocks 1 and 2 permit read and write access with key B. The secor trailer (block 3) is permanently write protected (only read access with key A & B to the access bits is permitted).
So you cannot update that secor's trailer block as it is permanently write protected.