Sources checked: 2026-11-11. Tested on a device by staff: not yet. This is compiled from the vendors' own pages, not from running it on a phone.
- "Developer Mode required". From iOS 16 on, Apple requires Developer Mode. Settings, Privacy and Security, scroll to Developer Mode, switch it on.
- "Untrusted Developer" when you open the app. Settings, General, VPN and Device Management, tap the email you signed with, then Trust.
- Installed, but no icon on the Home Screen. Reboot the device.
- "InstallProhibited". The device is supervised or restricted. Settings, Screen Time, Content and Privacy Restrictions, iTunes and App Store Purchases, Installing Apps, set to Allow.
- The computer does not see the device. Tap Trust on the device when asked, try another cable or port, and on Windows use the standalone iTunes from Apple, not the Microsoft Store version.
If none of these apply, the problem is probably in the signing step. See "Sideloadly will not log in to my Apple ID" and "SideStore will not refresh, log in or launch".
Full guide: https://nabzclan.vip/threads/65/
These steps can stop working when Apple or the tools change. The forum thread linked above is kept up to date; check it for the latest.