Hello. On my Kindle 3 Keyboard does not work. I installed "Update-mkk-20250419-k3w-B008_keystore-install.bin" and then replaced "KUAL-KDK-1.0.azw2" with the current 2.7.37 version. I get the message "The title is not signed by a registered developer". I also had Coolreader installed, which worked without KUAL, but now it does not work either. Please help, because the reader works perfectлъ and I recently changed its battery.
