Guides & wiki

Everything about iOS certificates and sideloading.

Plain-English guides on UDIDs, P12 certificates, Feather, KSign, ESign, Sideloadly, revocations and install errors.

Getting started

UDID, certificates and IPA files explained from zero.

How to find your iPhone or iPad UDID (with or without a computer)

Three ways to get your iOS device UDID: a one-tap profile on the phone, Finder/iTunes on a computer, or 3uTools. Needed to buy any signing certificate.

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Getting started5 min read

What is an iOS signing certificate? P12, mobileprovision and UDID explained

A plain-English explanation of iOS signing certificates: what the .p12 and .mobileprovision files are, why Apple requires them, and how sideloading apps works.

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Getting started4 min read

What is an IPA file and how to install one on iPhone without a computer

IPA files are iOS app packages. Learn where they come from, why they need signing, and how to install an IPA on iPhone or iPad without a PC using a certificate.

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Getting started3 min read

How to trust a developer app on iPhone (VPN & Device Management)

Seeing 'Untrusted Developer' after sideloading? Here's how to trust the certificate under Settings → General → VPN & Device Management, and what to do if the option is missing.

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Signing apps

Step-by-step for Feather, KSign, ESign, Sideloadly and LiveContainer.

Signing apps5 min read

How to sideload apps with Feather using a signing certificate

Step-by-step Feather tutorial: install Feather on iPhone, import your P12 certificate and mobileprovision, sign an IPA and install it — no computer, no jailbreak.

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Signing apps4 min read

KSign guide: import your certificate and install IPAs on iPhone

How to use KSign with a P12 signing certificate: one-tap install from lemoncert, manual certificate import, signing an IPA and fixing common KSign errors.

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Signing apps4 min read

ESign guide: import a P12 certificate and sign IPAs on iPhone

Complete ESign tutorial: install ESign, import your .p12 and .mobileprovision, sign IPA files on-device and install them — plus fixes for ESign errors.

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Signing apps4 min read

How to use a P12 certificate with Sideloadly (no 7-day expiry)

Use your own developer certificate in Sideloadly instead of a free Apple ID: switch signing mode to .p12, pick the mobileprovision, and install IPAs that don't expire weekly.

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Signing apps4 min read

LiveContainer guide: run many sideloaded apps from a single certificate

LiveContainer lets you run multiple IPAs inside one signed container app. Learn what it does, which certificates support it and how to set it up on iPhone.

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Signing apps6 min read

Best iOS sideloading apps in 2026: Feather, KSign, ESign, Sideloadly, AltStore, TrollStore

Compare the main ways to sideload apps on iPhone in 2026 — on-device signers (Feather, KSign, ESign), desktop tools (Sideloadly, AltStore) and TrollStore — and which need a certificate.

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Troubleshooting

Revoked certs, install errors, VPN and DNS problems.

Troubleshooting4 min read

Certificate revoked? What it means and how to get your apps back

Your sideloaded apps suddenly crash or say 'no longer available'? The certificate was revoked. Here's why it happens, how to check, and how to re-sign your apps in minutes.

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Troubleshooting5 min read

“Unable to install” & “integrity could not be verified”: how to fix sideload errors

Fix the most common iOS sideloading errors: Unable to Install, This app cannot be installed because its integrity could not be verified, Untrusted Developer, and installs stuck at 100%.

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Troubleshooting3 min read

Sideloaded app won't install on VPN or ad-block DNS? Here's why (and the fix)

VPNs, router VPNs, AdGuard, NextDNS and Pi-hole block the Apple endpoints iOS uses to verify certificates, breaking OTA installs. Learn what to whitelist and how to work around it.

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Buying & warranty

Packages, crypto payment, validity and what the warranty covers.

Buying & warranty4 min read

How to buy an iOS certificate with USDT, Bitcoin or Ethereum

Step-by-step: choose a package, enter your UDID, pay in USDT (TRC-20), BTC or ETH, and download your P12 certificate the moment the payment confirms. No account required.

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Buying & warranty4 min read

How long does an iOS certificate last? Validity, warranty and revocations explained

iOS developer certificates are valid up to 1 year, but the real question is revocation. Learn how validity works, what lemoncert's 60/150/300-day warranty covers and how to pick a package.

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Buying & warranty5 min read

Signing certificate vs $99 Apple Developer account vs free Apple ID: which should you use?

Compare the three ways to sign iOS apps — a purchased developer certificate, your own $99/year Apple Developer Program membership, and free Apple ID signing — by cost, limits and hassle.

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