KOReader can be installed on all *jailbroken* Kindle devices.
**NOTE:** The ability to jailbreak a Kindle device depends on both the model, the specific variant of its model, and the current firmware version it's running.
Detailing all of the intricacies this can involve is out of scope for this document, so, please check the current state of things on [MobileRead](https://www.mobileread.com/forums/forumdisplay.php?f=150). Currently, [this wiki page](https://wiki.mobileread.com/wiki/5_x_Jailbreak) should be a good starting point.
Detailing all of the intricacies this can involve is out of scope for this document, so, please check the current state of things on [MobileRead](https://www.mobileread.com/forums/forumdisplay.php?f=150). Currently, [this thread](https://www.mobileread.com/forums/showthread.php?t=320564) should be a good starting point.
In general, the newer the device, the trickier it gets.