ISSUE

After Android version upgrade, a password is required. But you have never been set the PIN.
After OS upgrade/downgrade, "To start Android, enter your password" message is displayed.

APPLIES TO

All Point Mobile devices with Android 7 or above

	Cause	Solution
1	Update to the version with lower security level	Perform a factory reset System requires the PIN when the security patch version is lower than the version before Android upgrade. The security patch version of the Android version to be upgrade may be lower than the current one depending on the patch upgrade time. Lower security patches may have security vulnerabilities affecting the devices, so the system asks to enter PIN to protect the stored privacy data. But because the PIN is an unknown program code, perform factory reset to use your device. < How to Factory Reset (By model) > PM30, PM67, PM75 Factory Reset PM351 Factory Reset PM352 / PM452 Factory Reset PM451 Factory Reset PM45 Factory Reset PM550 / PM560 Factory Reset PM5 Reset (Warmboot, Factory Reset) PM66, PM70, PM80 Factory Reset PM84 Factory Reset PM85 Factory Reset PM86 Factory Reset PM90 Factory Reset PM95 Factory Reset