The Virtual Memory Map for IOS-FS listed at: 0x10800000 - 0x11EE0000
In my 5.5.1(15702) FW.IMG (retail), it is at: 0x10700000 - 0x11C40000
Q: Is there any reason not to update it? (i.e. due to debug FW.IMG or older FW or ??)
A: That range belongs to firmware version 5.3.2 (debug). It should be updated, but the older range should also be kept for historical reference.