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Tap Choose IPA on the home screen and pick an .ipa file.
Select an IPA, sign with Apple ID or Ad Hoc, customize the app and install with Letra.
↓ Download Letra IPATap Choose IPA on the home screen and pick an .ipa file.
On the Configure screen, choose the signing method at the top: Ad Hoc or Apple ID.
Optionally:
Tap Sign.
When signing finishes, choose how to install:
Tap Install a Signed IPA under Options on the home screen, pick the file, and choose an install method.