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ABZU

Game info

TitleID: 0100C1300BBC6000
Explanation based on:

  • Internal version: 1.0.0,
  • Nintendo version ID: v0
  • BID: 59719CFCD1671B98
  • Engine: Unreal Engine 4.18.1

Details

Game is using SmoothFrameRateRange that blocks setting FPS above 40. We will be using another function to overwrite this limitation.

How to find offsets

We need to use disassembler in this case. I will provide instructions based on IDA as it will calculate automatically needed offsets for us.

After finishing disassembling main, we need to find this string (it's encoded as UTF-32-LE):

t.MaxFPS

then we go to its xref.

Below we need to find first STR after second BLR. Code looks like this

.text:0000007101FA30E0                 ADRP            X1, #aTMaxfps@PAGE ; "t.MaxFPS"
.text:0000007101FA30E4                 ADD             X1, X1, #aTMaxfps@PAGEOFF ; "t.MaxFPS"
.text:0000007101FA30E8                 ADRP            X2, #aCapsFpsToTheGi@PAGE ; "Caps FPS to the given value.  Set to <="...
.text:0000007101FA30EC                 ADD             X2, X2, #aCapsFpsToTheGi@PAGEOFF ; "Caps FPS to the given value.  Set to <="...
.text:0000007101FA30F0                 MOV             W3, WZR
.text:0000007101FA30F4                 BLR             X8
.text:0000007101FA30F8                 ADD             X8, X25, #0x10
.text:0000007101FA30FC                 STR             X0, [X22,#(qword_7106228ED8 - 0x71062288F0)]
.text:0000007101FA3100                 ADD             X19, X22, #0x5E0
.text:0000007101FA3104                 STR             X8, [X22,#(qword_7106228ED0 - 0x71062288F0)]
.text:0000007101FA3108                 LDR             X8, [X0]
.text:0000007101FA310C                 LDR             X8, [X8,#0x48]
.text:0000007101FA3110                 BLR             X8
.text:0000007101FA3114                 STR             X0, [X22,#(qword_7106228EE0 - 0x71062288F0)]

So final address is stored at 0x6228EE0.

Our final address stores pointer that points to two floats. t.MaxFPS is set to 0.
Entry for 15 FPS will look like this:

15FPS:
  # t.MaxFPS
  -
    type: write
    address: [MAIN, 0x6228EE0, 0]
    value_type: float
    value: [15, 15]
  -
    type: block
    what: timing

But for 30 FPS like this (since plugin's FPS lock is blocked by default at 30 and 60 FPS):

30FPS:
  # t.MaxFPS (default value)
  -
    type: write
    address: [MAIN, 0x6228EE0, 0]
    value_type: float
    value: [0, 0]