Followed these instructions
https://github.com/koreader/koreader...Kindle-devices
jailbreak went fine, KPV launcher was installed correctly (the screen said so), then I unzipped koreader into the root directory of kindle (tried stable, nightly, both kindle-arm-linux and kindle-legacy-arm-linux) and the koreader wont run.. every time I try to start a file thats not mobi or txt I get this Application Error "The selected application could not be started. Please try again." I tried.. tried many times. tried several different version of koreader. always the same. kindle firmware version is 5.3.7.2
any idea what could be wrong?