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前面有人提供簡易的方式，換sim卡然後設定忘記密碼，的確有機會可以登入跟改變密碼。如果還是不行。
那或者也可以參考這篇：
當親友不幸告別人世，家屬如何申請取回已故使用者 Google、Facebook 帳號資料
---------------
心態決定未來，
選擇權在自己
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requirements :
Aroma file manager
memory card for the device
Step 1:
First, download Aroma file manager(is ZIP file)
Step 2:
After you download “Aroma file manager” place it in your card[SD card] insert the card into your locked Android device.
Step 3:
Open Stock Recovery Mode by rebooting your Android device and pressing PowerKey and volume up key simultaneously
NOTE:Different phones may have different methods to open stock recovery mode, so if you face any problems comment and I will give you the solution.
Step 4:
After entering into recovery mode use Volume+ and Volume- buttons to scroll up and down. For select use Power button or Home button.
Step 5:
From there click on “Install zip from SD card” and navigate to where you placed “Aroma File Manager” click and install.
Step 6:
After installing, it will open in recovery mode.
Step 7:
From the “Aroma File Manager” nagivate to settings >> go to the bottom and click on “Automount All Devices On Start” and then exit.
REPEAT STEP 5&6 AGAIN.
Step 8:
After this, you will get the “Aroma File Manager” opened again.
Step 9:
Now navigate to Data Folder>>System Folder and Find >>“gesture.key” or “password.key” for pattern lock or password lock respectively.
Step 10:
Delete that any one file and then exit “Aroma File Manager” and reboot your device.
After rebooting you will notice that password or pattern will not removed yet. But don't worry draw any random pattern your device will unlock but remember that pattern.
Congratulations, you have successfully unlocked your phone without loosing any data.
參考一下，我只是看過這些步驟，沒有試過，希望有幫助。
