Finding a legitimate academic paper specifically titled "iPad 2 iOS 9.3.5 iCloud Bypass Untethered" is difficult because specific consumer exploits are rarely the subject of formal academic literature until years later (usually when the vulnerability is patched and analyzed).
However, the "Untethered" aspect for the iPad 2 on iOS 9.3.5 is a fascinating case study in hardware security failures.
The most interesting and relevant paper/technical analysis regarding this specific device and exploit method is not a standard academic PDF, but rather the technical documentation of the "Duplicate" / "Device" Exploit (formerly checkm8) adapted for the A5 chip. Ipad 2 9.3.5 Icloud Bypass Untethered
Here is the most relevant technical breakdown, presented in the format of a research paper analysis, as this is the primary source for how the untethered bypass works on that specific device.
To confirm it is truly untethered:
The iPad 2 holds a special place in the history of Apple devices. Despite its age, it remains a functional tablet for basic tasks like web browsing and media consumption. However, because of its age, many of these devices find their way into the second-hand market with iCloud Activation Locks active.
If you have an iPad 2 running iOS 9.3.5 and are looking for an "Untethered" iCloud Bypass, here is everything you need to know about the current state of the scene, the tools available, and the reality of the results. Set up the iPad as a new device
This is the killer feature.
.mp4 or .mkv files into the VLC app via iTunes File Sharing.Let's be honest about the "Lifestyle" aspect. The Ultimate Guide to iPad 2 (iOS 9
.ipa files (app installers). This isn't a "one click" jailbreak, but a 30-minute project.