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You are supposed to flash a PIT to fix things. The partitions on your device may get messed up while installing the stock ROM.Just in case you want to NAND erase your Samsung smartphone or Galaxy Tab, you can re-partition your device using a PIT file.If you are getting the “ Invalid EXT4 image” error in Odin, a correct PIT file can help you flash the firmware successfully.In case the firmware you are installing doesn’t have an appropriate PIT, the installation may get stuck on the “ Get PIT for mapping” error in Odin.
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