I can help you with that. Here are some ways to bypass iPhone 6 passcode without Siri:
1. Using iTunes: Connect your iPhone 6 with the computer with iTunes installed, then launch iTunes. After iTunes detecting your device, click on your iPhone 6 on the left side, then tap "Summary" > "Restore iPhone". Click "Restore" again and wait for the process finishes. After that, you can get into your iPhone 6 without passcode.
2. Using FoneLab iOS Unlocker: Free download, install, and launch FoneLab iOS Unlocker. Choose Wipe Passcode on the main interface. Then plug iPhone into the computer via a lightning USB cable. Check and confirm your iPhone 6 information before unlocking.
3. Using UkeySoft Unlocker: To bypass the iPhone screen passcode, just click “Unlock” button to start removing iPhone 6/6s passcode without using Siri.
4. Using iMyFone LockWiper: Launch the software on your computer, select "Remove the Screen Lock" mode and click "Start". Connect the iPhone to the computer using the lightning cable. Select the correct firmware version and click "Download". After downloading, click "Start to Extract" and then click "Start Unlock". Wait for a few minutes until it is done.