Question [Q] Backup call log and Text Messages from a locked device

I'm trying to save call logs and text messages from a locked device.
The device is locked, it says you have to sign in with Google account. The owner just needs call logs and text messages not anything else.(I'm not the owner)
I tried to pull database via adb and no success since I don't have root access. tried to backup the whole device data with "adb backup" and it said unlock the device to confirm. tried to remove gesture.key with adb and again no success(needs root access)
Is there any way at all to do this?
Please let me know if you think there is no way, because I'm returning the phone to my friend and I need a proof to show that it can't be done!
Thank you

p.s: Huawei ascend G510 with no root access. usb debugging is enabled