This is an older but sometimes effective trick for ZTE devices with outdated firmware.
Note: ZTE has patched this on most Blade A73 units running the latest security patches. However, if your device hasn't been updated, it remains a viable option. bypass google verification on zte blade a73 exclusive
If you attempt this on a stock ZTE Blade A73 with the latest security patch, here is what you will encounter: This is an older but sometimes effective trick
If Method 1 does not work due to software updates, try this alternative: Note: ZTE has patched this on most Blade