It took some digging to get KOReader and its prerequisites installed, so I’ll put the info here. All downloads besides renametobin and KOReader come from the
NiLuJe's Snapshots thread.
MR Package Installer and KUAL
MR (mobileread) Package Installer
KUAL (Kindle Unified Application Launcher)
1) Extract
mrpackages and
extension folders from
kual-mrinstaller-1.7.N-r18896.tar.xz to your Kindle’s root folder.
2) Extract
Update_KUALBooklet_e3deabf_install.bin file from
KUAL-e3deabf-20220213.tar.xz (coplate version of KUAL) to
mrpackages folder which is in your Kindle’s root folder.
3) Eject you Kindle and open the search on it and type
;log mrpi (installs KUAL and MRInstaller).
Source: reply by FireFrog on this jailbreak thread, also see next reply by voidnull
renametobin
Prevents OTA updates from Amazon so you can make sure your Kindle doesn’t update which could blow away your jailbreak.
1) Extract
renametobin folder from
renameotabin.zip to the
extensions folder of your Kindle.
2) Eject your Kindle and launch KUAL on it.
3) Tap “Rename OTA Binaries”, then tap “Rename” (Only tap “Restore” when you want to re-enable OTA updates or if you want manually update firmware via "Update Your Kindle" from Settings menu on Kindle)
Source: renametobin reply by re4om on this jailbreak thread
KOReader
1) Extract
extensions and
koreader folders from
koreader-kindlepw2-v2022.03.1.zip to Kindle’s root folder.
2) Eject your Kindle and launch KUAL on it.
3) Tap “KOReader” then tap “Start KOReader”.
4) Wait ~10 seconds for KORreader to open.
Source: Installation on Kindle devices
Edit 04-29-2022: Step 3 of renameotabin update suggested by re4om and correction of MRInstaller to mrpackages folder pointed out by lovegamehp