Since the A37m runs and may be unrooted:
Fortunately, there are several methods to recover and unlock data from your Oppo A37m's userdata partition: oppo a37m userdata
Absolutely. Unlocking the bootloader on an OPPO A37M triggers a full wipe of internal storage. Always take a complete backup first. Since the A37m runs and may be unrooted:
This usually happens after an incomplete OTA update or sudden power loss. You will need to flash the stock firmware using SP Flash Tool (advanced users only), which erases everything. This usually happens after an incomplete OTA update
Take out the microSD card and SIM card.
. You must know the Google account credentials to log back in. Hardware Check: Use secret code *#36446337# to test hardware parameters and phone information. Software Reset Code: You can trigger a factory reset from the dialer using How to remove pattern on Oppo A37m? - Facebook
Oppo provides official tools to help users recover their data. You can try using: