>>
0x3FFFFE: 0x25 (DEVID1)
0x3FFFFF: 0x04 (DEVID2)

The first (0x25) I interpret to read as: 18F452 Rev. 5 but what does
DEVID2
indicate? The data sheet only says (that I could find) that it identifies
the
part number in DEVID1.
<<

This is incorrect.  See "Programming for PIC18Fxx2/Fxx8 Flash MCUs"
(DS39576A), page 22, section 5.2 "Device ID Word", and table 5-1 "Device
ID Value".

Both bytes are required to identify the particular chip.  Your DEVID1 in
this case only indicates 18F448 or 18F452 rev 5.  DEVID2 nails it down to
18F452.


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