Android devices display a System 7 error when a system update or custom ROM fails to flash, and while the Status 7 error is one of the more common errors associated with the flashing of ZIP files, it is also one of the less serious and almost always fixable ones.
For Non-Rooted Devices
The only instance in which the Status 7 error can be seen on a non-rooted Android device is when a person, instead of waiting for a new system update to reach them Over the Air, decides to sideload and flash a ZIP file containing the official software update onto their device. A non-rooted Android device only displays a Status 7 error when a system update is being flashed onto it and something is found to be out of place or, to be more precise, modified. The Status 7 error only affects non-rooted devices that are not in complete stock condition, so the only way to fix the Status 7 error on a non-rooted Android device is to restore every bit of the device back to its stock condition. If the device is running on a custom kernel, the stock kernel needs to be flashed; if the device has a custom recovery image, the stock recovery image needs to be flashed; and so on.
For Rooted Devices
Android users often see Status 7 errors on rooted Android devices when flashing custom ROMs. The two most common causes of the Status 7 error on rooted Android devices are an outdated version of a custom recovery and a faulty custom recovery. To fix this issue on a rooted device, all a person need do is update to the latest version of the custom recovery they have on their device or switch to a different custom recovery entirely. However, in the event that these two solutions don’t work (which is a rare case), the updater-script of the custom ROM should be edited through the following process:
- Copy the ZIP file of the custom ROM onto a computer. 
- Unzip the file. 
- Go to META-INF > com > google > android. 
- Right click on the file updater-script and click on Rename. 
- Change the name of the file to “updater-script.txt”. 
- Open the file with a text editor. 
- Delete part of the text starting from “assert” down to the next semicolon. 
- Save the file, close the text editor and change the name of the file back to updater-script. 
- Compress all of the contents of the unzipped ROM file into a new ZIP file, copy the new ZIP file to the device and flash the custom ROM which will now not give a Status 7 error. 
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