AltStore opens to black screen and crashes (iOS 26.4)

[leodikc]

Hi, I’m having an issue with AltStore on iOS 26.4.

After installing AltStore via AltServer (Windows), the app installs successfully and shows up on my iPhone. I trusted the developer profile in Settings, but when I try to open AltStore, it only shows a black screen for a second and then closes immediately.

What I already tried:
Reinstalling AltStore multiple times
Resetting “Location & Privacy”
Restarting iPhone and PC
Using AltServer as administrator
Using both latest and older AltServer versions
Verifying the app in Settings
Nothing worked, the issue persists.

Other sideloaded apps (like Instagram) were working before, but AltStore itself cannot be opened at all.

Device info:
iPhone model: 15
iOS version: 26.4
AltServer: Windows

It seems like this might be related to iOS 26.4, because I’ve seen similar reports. Any help would be appreciated.

[privetgoth]

yes i've been having this same problem too. i recently installed 26.4 version. not the beta and when i press on altstore, it loads up for a split second then crashes. i've tried everything and nothing seems to be working. i guess we just have to wait. time will tell.