Unable to upgrade ROM [status 7] and Failed to verify whole-life package i am having an issue upgrading my Serioux S800TAB to android 4.2.2: i get an error: status 7. I have googled the error, and done what the tutorial said, but now i have the error "Failed to verify whole-life package". Any tips on how can i make the ROM work?
You can't just download any ROM and remove the asserts from the manifest. That is a sure fire way to brick your device. You need to find a ROM that is compatible with your device. 

The status 7 error is there because you are installing a package that doesn't match the hardware you are trying to install it on. It is a safety measure. The guide for deleting the asserts from the manifest is only meant to allow flashing the file in an older recovery that doesn't recognize the asserts in the manifest. When doing this you have to be absolutely sure that you are installing on the proper device.  If you delete the asserts and install on an incompatible device, it may fail still or it could flash, rendering your device useless. 

Find a proper ROM for your device and install that. Don't just pick one unless you want to brick your device.