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SLB2 is the format used to store the encrypted bootloaders on the device.

ENC Files

Offset Size Description
0x0 0x4 0x64B2C8E5 magic
0x4 0x4 Offset to data
0x8 0x4 Unknown
0xC 0x4 Unknown/Zero
0x10 0x4 Data size
0x14 0xC Unknown
0x20 0x20 Hash ?
0x40 0x10 Version in ASCII
0x50 0x90 Zero
0xE0 Until Data Encrypted Header

The last 0x340 bytes is a footer that likely contains a signed MAC of the plaintext data.