My relative has a GoClever Tab R75 and he put in too many patterns attempts so now it only says that you can log in with a google account, but he doesn't have one linked with the tablet itself.
Things I have tried, all of the possible combinations, I only have a power/reset/motherboard button to work with.
Reset button only shutdown's the tablet.
I got into an active mode with the motherboard + power button few times, but it gave me an android man with a red triangle.
Same goes for some rooted R75 link going around the forum, which I booted from the SD card.
There must be another way to fix this, it's not possible there isn't a solution in 2014, somebody probably knows, I hope they see this.
They somehow do it in repair shops.