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I have the RCT6303W87M ANDROID. 6.0_V15-V1.15.30 Tablet and when I push the power button and the up volume button a screen comes up to reboot the system wipe data/factory reset and cache partition. When I did both of those and turned on the tablet it goes back to the welcome page and I have to sign in a WiFi then once connected I have to sign in using the original sign in when I got the tablet last year I forgot the password so I made a new one and it still won’t let me in. Is there a way I can get this fixed?

Try to recover your password and your sim card can be replaced even if u loose it, there is still a way if you download a rom prefer a stock and flash it through Odin or similar software. Read instructions carefully before flashing cause there you loose your warranty and have risk of getting your device bricked. Another way I have not used it though there are apps for skipping Google sign in please check you tube video to Know how that may work for you… Enter keywords in YouTube … Bypass Google sign in…