Error 1601 updating iphone
Apple's support page for specific errors on i Tunes isn't all that helpful.
For starters, Apple isn't all that interested in people downgrading their i OS firmware.
Our inventory of emerging environmental contaminants such as Brominated Flame Retardants (BFRs) and Perfluorinated Compounds (PFCs) also continues to expand.
Wellington currently offers a number of individual native and mass-labelled reference standards as well as many solution/mixtures to support research in these areas.
If you see error 1671, i Tunes is downloading necessary software. To see how long the download should take, you can click the down arrow in the upper-right corner of i Tunes.
Update to i Tunes 12.5.4 or later to fix error 1671.
An unknown error occurred [error number]." If you still see the error message, find your error below to learn what to do.But in some cases (like ours), it worked for an update too.It's mostly because we had a jailbroken i Phone that wasn't restored to factory settings.If you see error 1015 or a message that says, "The required resource can't be found," your device might have unauthorized i OS modifications ("jailbreaking").Or you might be trying to install an earlier version of i OS (downgrading).
Here's how it works: Note #2: If you wish to downgrade, you'll need to save SHSH blobs either to your local drive or on Cydia.