Editing FW update image file
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