If the device doesn't have USB debugging enabled in the developer settings before you forgot the pin then you're essentially screwed since the only other method that doesn't use gmail or factory reset is by using the ADB (Android Debug Bridge) in order to delete the file which the pin is saved in which can only be achieved by having USB debugging enabled. If you don't have USB debugging on it then you could attempt to install a custom recovery on the device and then flash a file which will delete the pin file for you.
If you want to try the custom recovery way then add me on Skype or something and i can try help you.
Edit: going to bed currently, if you add me then i'll help you when i get up.
Last edited by Harry; 07-09-2016 at 07:50 PM.
Join date - July 15th 2012
Premium - August 2nd 2016 fuck all else currently lmao
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