How to check if custom EDID indeed takes effect?

[alexey-danilov]

Hey everyone! As the name suggests, I cannot get custom EDID to work
My configuration: OS 15.3.1, Monitor Dell 4025QW, Running Hackintosh with OpenCore. Video is RX 560 4 GB, connected via DisplayPort cable; cable itself came with the monitor, so should be good. Currently running a trial version of BD Version 3.3.4 Build 37528. SIP status (not that it is important for BetterDisplay?):

Configuration:
	Apple Internal: disabled
	Kext Signing: disabled
	Filesystem Protections: disabled
	Debugging Restrictions: enabled
	DTrace Restrictions: enabled
	NVRAM Protections: enabled
	BaseSystem Verification: enabled

My goal is to be able to run display at 3360 * 1417 @ 100+ Hz. Currently it is locked at 60 max. I've been following this guide https://www.reddit.com/r/ultrawidemasterrace/comments/1bciq31/dell_u4025qw_create_custom_edid_to_get_100_hz/ and here is what I've done so far:

1. Created custom EDID (by exporting, then editing with AW editor - all pretty standard; I went with 100Hz variant)
2. Tried to load it via Load Custom EDID -> which results in EDID data binary successfully loaded
3. There is a prompt saying There are some unapplied system configuration changes -> clicked Apply
4. OS prompt saying BetterDisplay wants to make changes -> Provided user password, clicked OK
5. Back in BD there is an info popup saying -> Configuration changes require reboot or activation

Rebooted, but nothing happens -> still max refresh rate is 60Hz in system settings. BD runs at system startup and does not see any other refresh rates as well.

Could it be that there are some specific permissions missing for BD in system settings?
I'm fine with purchasing a license if I get the result I want, however, reboot should have sufficed as well to test things out? (according the the prompt I see: Configuration changes required reboot or activation)

[waydabber]

Try changing some other obviously verifiable EDID data, like the display name. If that changes after reboot, then the EDID override does take place - the missing resolution is due to hardware or connection limitations, not an EDID issue.