Workaround to get high resolution image downloads. This is an anomaly with Bluestacks that refuses KFX downloads, for now at least. So I suggest you keep a Bluestacks version that has the old 4.16 app which does not support KFX. To get high res do this:
- Create a new Nougat VM with the Bluestacks multi-instance manager. (alternatively you can clone your working Kindle 4.16 VM, then skip #2)
- Follow the instructions in first post to install, login, and backup the Kindle for Android version 4.16.
- Download Kindle for Android version 8.51.1.0 (oldversion doesn't have it, I used apkpure Kindle for Android version 8.51.1.0 - the arm64-v8a will only work for 64bit Bluestacks and the armeabi-v7a will work for 32bit and 64bit Bluestacks)
- Install the downloaded APK - if using adb, you need to use "adb install -r XYZ.apk" to update existing app, the builtin APK installer in Bluestacks does that automatically.
- download and install the AZW6 Image Merge into calibre
- delete and redownload books that have previously been downloaded with the Kindle 4.16 version, e.g. if you cloned your instance
- for each book extract the .prc and .ast file (the quick and dirty way is to use "adb pull /sdcard/Android/data/com.amazon.kindle/files" - then traverse the files folder and drag and drop the .prc files into calibre)
This will NOT work on Android Emulator or on a Nexus7 tablet, it probably won't work anywhere else than Bluestacks.