I've been having malware issues with my Blu Grand Max and also it couldn't install a system update due to the file 'update.zip' being 'incorrect'.
I've tried a factory reset before (which didn't sort the malware), but decided to have another try today. After resetting the phone I'm now stuck on the startup process.
It's saying there's an update so the phone needs to be restarted - this is the same update that it couldn't install before - so therefore just returns to the Android Recovery screen with the error message. It doesn't show a skip button to bypass the update.
Is there any way I can download the update to sd card and install from the Recovery screen? If so, where do I download this from?
Thanks for your help.