K2 Question regarding OLD jailbreak

fxjade · 02-04-2026, 12:09 PM

Eons ago, I jailbroke my K2 (international etidion 3G, serial starting with B003) with a wonky method (i think the creator of either the exploit or a specific part of it was named something vaguely chinese iirc), that allowed me to flash the K3 firmware (currently running 3.2.1), and use its fonts and features.

It runs sluggish as hell (especially when off - to on), and never cared to much, since the actual page turns are fine imho. But I have recently found out that there are a series of updated exploits and the existance of KOreader (yes, I know, I'm *very* late to the party).

I've recently got an xteink X4 that supports KOreader syncing, and would very much like to enjoy this feature when hopping back on to my Kindle.

Since my K2 kindle is in this frankenstein state, I was wondering if it is possible either to revert it (back to OG 2.5.8) and then start with the legacy exploits + legacy variant of KOreader, or if I'm stuck in this limbo. Can I safely use a 3.2.1 variant of the jailbrake in this state?

Any information / pointers are welcome.

Frogm4n · 02-04-2026, 07:13 PM

Does your K2 still have a functional network connection? The 3G it used has been shut off in much of the world. If it's offline then the KOSync won't be able to do anything. Kindles didn't get WiFi until the K3.

fxjade · 02-04-2026, 07:18 PM

Quote:

Originally Posted by Frogm4n

Does your K2 still have a functional network connection? The 3G it used has been shut off in much of the world. If it's offline then the KOSync won't be able to do anything. Kindles didn't get WiFi until the K3.

Huh, I feel rather dumb but I must confess I had not thought about that. You are pretty much correct in that regard.

That being said, could it still be synced via USBnetwork? As a manual last resort?

I any case, I'd still be interested in knowing if I can somehow get back to the OG firmware.

j.p.s · 02-04-2026, 07:30 PM

I think it is possible for the USBnetwork host computer to route (AKA forward) packets from the kindle to the internet, but I can't find anything about it. I think the technique is the same as is done by phones in wifi hotspot mode, but I don't know anything about it.

02-04-2026, 12:09 PM	#1
fxjade Junior Member Posts: 2 Karma: 10 Join Date: Feb 2026 Device: Kindle2 (international)	Question regarding OLD jailbreak Eons ago, I jailbroke my K2 (international etidion 3G, serial starting with B003) with a wonky method (i think the creator of either the exploit or a specific part of it was named something vaguely chinese iirc), that allowed me to flash the K3 firmware (currently running 3.2.1), and use its fonts and features. It runs sluggish as hell (especially when off - to on), and never cared to much, since the actual page turns are fine imho. But I have recently found out that there are a series of updated exploits and the existance of KOreader (yes, I know, I'm very late to the party). I've recently got an xteink X4 that supports KOreader syncing, and would very much like to enjoy this feature when hopping back on to my Kindle. Since my K2 kindle is in this frankenstein state, I was wondering if it is possible either to revert it (back to OG 2.5.8) and then start with the legacy exploits + legacy variant of KOreader, or if I'm stuck in this limbo. Can I safely use a 3.2.1 variant of the jailbrake in this state? Any information / pointers are welcome. Last edited by fxjade; 02-04-2026 at 12:10 PM. Reason: typo

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02-04-2026, 07:13 PM	#2
Frogm4n Fanatic Posts: 578 Karma: 4016635 Join Date: Jul 2023 Device: Scribe 2022, OA2, PRS-350	Does your K2 still have a functional network connection? The 3G it used has been shut off in much of the world. If it's offline then the KOSync won't be able to do anything. Kindles didn't get WiFi until the K3.

02-04-2026, 07:30 PM	#4
j.p.s Grand Sorcerer Posts: 5,938 Karma: 106187745 Join Date: Apr 2011 Device: pb360	I think it is possible for the USBnetwork host computer to route (AKA forward) packets from the kindle to the internet, but I can't find anything about it. I think the technique is the same as is done by phones in wifi hotspot mode, but I don't know anything about it.