October 20th, 2012, 11:37 AM
Join Date: Mar 2012
Location: Varazdin, Croatia
Device(s): Alot of Amlogic based devices :)
Carrier: MultiPlus Mobile
Thanked 215 Times in 126 Posts
Things you need: 7zip file manager and Notepad++ and signapk utility (google for it, in their description is usually resigning APK, but works for update.zip-s).
Open update.zip with 7zip, go to META-INF folder and delete CERT.RSA, CERT.SF and MANIFEST.MF files.
After that go to META-INF/com/google/android folder inside zip archive and extract somewhere (desktop?) updater-script file.
Now, open that updater-script file with Notepad++ and remove line that looks similar to this:
Save changes and replace that file in your archive.
After that, with signapk utility resign your update.zip and flash.