Thats because the signing part is missing (you need Huawei's private rsa key for this). Since i don't own a Huawei device i cannot really test and noone seems to be interested to test anyway. I think most users use the extract features, so most updates are in that part.I unpacked the Update.app to modify, once you compress it again, it fails when installing it, I really need since my usb port was broken, so I can not even rooting, or installing roms. So this program is my solution, please do not let it to update, I really need. Sorry for my bad English.
btw, how do you charge your phone anyway without usb ?