Default Question for DEVS or Experienced Users

Im trying to extract the apk app folder inside the Russia SER official mk8 rom for i9500

tried odinatrix but it didn't work

tried ext4 unpacker and it didnot work either

so i want to know wich decompresser are u using to make ur 4.3 builds ?

how can i open the system.img file from a 4.3 rom?
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