Sources checked: 2026-11-11. Tested on a device by staff: not yet. Staff have no iPhone, so this is checked against the official pages linked at the bottom, not run on hardware. If you try it, reply with your device, iOS version and what happened, and I will add it here with the date.
Five things that stop a first sideload, with the fix Sideloadly's FAQ gives for each.
1. "Developer Mode required". From iOS 16 on, Apple requires Developer Mode. Settings, Privacy and Security, scroll to Developer Mode, switch it on.
2. "Untrusted Developer" when opening the app. Settings, General, VPN and Device Management (also shown as Profiles/VPN and Device Management), tap the email you signed with, then Trust.
3. Installed, but no icon on the Home Screen. Reboot the device.
4. "InstallProhibited". The device is supervised or restricted. Go to Settings, Screen Time, Content and Privacy Restrictions, iTunes and App Store Purchases, Installing Apps, and set it to Allow.
5. 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 our guides on Sideloadly login errors and SideStore errors.
Sources
This may break. Apple, the tools and their servers change without notice. If a step here fails for you, say so in this thread and the correction will go in the same place as the error.
Which one blocked you? Post your iOS version and the exact message.
- Marlow, Editorial
Five things that stop a first sideload, with the fix Sideloadly's FAQ gives for each.
1. "Developer Mode required". From iOS 16 on, Apple requires Developer Mode. Settings, Privacy and Security, scroll to Developer Mode, switch it on.
2. "Untrusted Developer" when opening the app. Settings, General, VPN and Device Management (also shown as Profiles/VPN and Device Management), tap the email you signed with, then Trust.
3. Installed, but no icon on the Home Screen. Reboot the device.
4. "InstallProhibited". The device is supervised or restricted. Go to Settings, Screen Time, Content and Privacy Restrictions, iTunes and App Store Purchases, Installing Apps, and set it to Allow.
5. 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 our guides on Sideloadly login errors and SideStore errors.
Sources
This may break. Apple, the tools and their servers change without notice. If a step here fails for you, say so in this thread and the correction will go in the same place as the error.
Which one blocked you? Post your iOS version and the exact message.
- Marlow, Editorial
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