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Mobi is terrible. Only K1, K2 & DX family need mobi.
azw3 is OK. Works from K3 onwards.
Likely your app only works with ereaders that connect as USB mass storage? Been able to copy to Kindle or Kobo as long as the format was compatible and no DRM since Android 4.x as long as OTG supported and a suitable mini, micro or C adaptor + regular USB A to whatever (on ereader) cable is used via a file manager.
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