I'll use nurses add-on 'Torn-Bookmark' as an example.
- Open pakchunk0-WindowsNoEditor.pak in Fmodel.
- Go to Deadbydaylight > Content > Blueprints > ItemAddons > BlinkerAddons > TornBookmark.uasset
- Scroll down the uasset file to find out what the modifier-values are. In this case 1.5 recharge time.
- Right click the add-on file and Export raw data.
- Open the uexp file that you downloaded in HxD. Ex: TornBookmark.uexp
- Open pakchunk0-WindowsNoEditor.pak in HxD
- Copy the hex code from the uexp and use CTRL + F to figure out where it is in the pak file.
- CTRL + F to find the floating point number you want to change Ex: 1.5
- After its selected, 1.5 shows up in the table under 'Single(Float 32)' just change the value inside the table(I used a new value like -2 because a negative number decreases blink recharge time).
- CTRL + S. Save the file and your finished.
Same thing for items like flashlights except you find their file under ItemAddons > FlashlightAddons
(The only modifier for an item that seems to work is flashlight lenses range).