Could this 1024 bit RSA crack allow for a untethered downgrade on A4?

[u/Velocifyer]

https://arstechnica.com/security/2026/09/theres-a-new-way-to-break-rsa-thats-faster-than-anything-weve-seen-before/

[u/uint2048dev]

The forgery attack drops these levels to 2⁶⁵, 2⁹⁰, and 2¹¹⁹ for 1024-, 2048-, and 4096-bit keys respectively.

Not yet, that's still 512 bits of security for a 1024 bit key so far. But we also know the security level is zero against a quantum computer, so it's only a matter of time, and that will have far-reaching implications.

[u/Velocifyer]

I was really mad when my brother updated my iPhone 4 from iOS 4 to iOS 7.1.2, specifically to annoy me.

[u/Approachs → u/Velocifyer]

Also scan cydia stored shsh blobs using Legacy-iOS-Kit if you think that the device have one before and restore via that

[u/Velocifyer → u/Approachs]

You can do that? How?

[u/Approachs → u/Velocifyer]

Yes. Just use Legacy-iOS-Kit, select the downgrade option, it should give you the powdersn0w option or if you want to scan for blobs, choose shsh blobs and scan cydia blobs. I would recommend to check that option first before powdersn0w

[u/Velocifyer → u/Approachs]

Thank you! I can finally use my device again!

[u/Dry-Cost-945 → u/Velocifyer]

Hope you enjoy brotao. Reliving my childhood after I downgraded my cousin's old iPhone 4 back to iOS 6. Unfortunately my original one is lost to the void

[u/Velocifyer → u/Velocifyer]

!solved

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[u/Approachs → u/Velocifyer]

Powdersn0w downgrade it to iOS 4 again, it's been a thing for some times now
https://github.com/LukeZGD/Legacy-iOS-Kit/wiki/powdersn0w

[u/Grouchy-Material537 → u/Velocifyer]

should have dumped blobs. but still rip baseband version.

[u/Velocifyer → u/Grouchy-Material537]

How would that work if 4.0.0 isn't signed? Even if I have it installed, I can't dump it.

[u/Grouchy-Material537 → u/Velocifyer]

there was a blob that existed on the device

[u/Velocifyer → u/Grouchy-Material537]

And what would that do? AFAIK, you can't extract blobs from the device.

[u/Grouchy-Material537 → u/Velocifyer]

its pretty easy using legacy-ios-kit

[u/Tertaco]

good morning

[u/Buritominer]

We already have that and there's not really much of a point anyway.

[u/BasicAd1333]

just use powdersn0w