After updating Android 7.1 to Android 9 on NOKIA 3, screen lock says WRONG PIN

Yesterday I updated my NOKIA 3 android 7.1 to Android 9. After loading it, when I booted it for the first time, it does not recognise the PIN which I used with Android 7.1. I use the same PIN for both - Power ON and screen Lock. Phone reconises the PIN for Power ON but does not recognise for screen lock.

I do not want to lose the data. so Please let me know if there is a way to unlock it other than HARD RESET. Are there any patches on Android 9 which can be run on SD card and reset the password?

I am desperate. Please help.

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