[Miscellaneous Android Development] iXmerof:
Hello, I get just today a GoClever Tab r76.2 to reset the forgotten pin from the locksreen. Device was used mainly for Pou and Facebook, so there was no root, no usb debugging, my PC was not set as trusted device, just like from the store with PIN set. Installed system is Android 4.1

Because it took me whole morning and I found a lot of answers that "it cannot be done, you have to factory reset" I want to show you my steps to make this process easier for people in need. This method shouldn't erase any data from your device

but always remember to have a backup

It is based on the following tutorial: http://xdaforums.com/showthread.php?t=2601933 , but still it was not enough for me so I want to provide more details.

Step 1.

The very important thing is to install drivers for the device. To make this process the easiest I get my old, good Asus netbook with Windows XP installed. You can install it also on VirtualMachine, it is not very mandatory but my next steps will be based on this configuration.

There is a need for two types of drivers: Rockchip drivers to flash the memory and ADB Drivers.

1.1) Rockchip drivers can be found in the thread linked above, I am providing mirror at the bottom of this thread. Just doubleclick on the exe, accept the risk and install, that's all for now.

1.2 ADB drivers are provided in the second package attached. To install adb drivers go to recovery.

To switch tablet to the Recovery Mode you have to switch it off (not reboot), turn it on, just when the BootScreen will appear tap Vol+ until you will see opened Android Robot with exclamation mark.

What's interesting, when you double click Vol+ this time you can switch to Android Recovery menu and factory reset the device

In device manager (Win+R, type: devmgmt.msc and press ENTER) install drivers for Tab r76 device manually, by providing direct location to the .ini file from the folder.

Leave tablet in Recovery.

Step 2.

People from some Russian Android forum prepared package with pre-configured adb for rockchip devices. Just download attachment 2.1, extract it, install, open Command Line and "cd" to directory with adb.exe, very useful.

Step 3.

Now we will root the device and install CWM. Download file from the attachment 3.1, unzip it and run "RK29Update.exe", don't click any button (especially the one called "Erase", it will brick your device), don't change any setting, your tablet will be not found at the moment.

This package belongs to the author of the original tutorial.

Step 4.

In command line enter "adb devices" to check if your tablet is visible, you should see something like "0123456789ABCDEF recovery", if yes enter "adb reboot bootloader" and press enter. Tablet will reboot, the screen will remain black, system will install the Rockchip driver, RK29Update.exe will find the device (IF NOT just reboot to recovery again and reboot to bootloader from adb again, driver installation might interrupt this process), press Run button in the application it will flash the device with root patch and CWM, device will reboot to CWM recovery.

Step 5.

Download attachment nr 5.1 (original source: http://xdaforums.com/showthread.php?t=2437946) and put the zip to the SD card (card has to be compatible with the device - most secure solution is having FAT32 filesystem), put it to the tablet, install zip from external source (not sdcard, it's internal memory).

After reboot of the device ("restart system now" option in main page of CWM) your device should welcome you without screen locked by any security possible and your settings should remain untouched.

From now everybody should be able to reset it's PIN in the easy way :) Have fun

CC: You are allowed to copy this tutorial anywhere, mirror the links also, but please leave a link to the original thread.