Editing FW update IMG

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Aug 26, 2014, 10:38:46 PM via Website


I need to replace a few files from a Firmware update image. I tried two ways ways:

1- editing straight in WinRAR
2- Unzipping, editing and compressing again

In both cases the IMG file looked right. test for problems runs fine, no issues, but when I try to update the device it won't pass on package check and the operation is aborted. I tried to save in both ZIP and IMG extensions, doesn't work in either one.

IMHO it must be related to checksum error. How can it be fixed?

The device is a Geniatech Media Center ARTV1220 running Android 4.2.2

Any clues?