Before beginning this procedure, completely power off your phone.

Prepare an iOpener and apply it to the back cover to soften the adhesive.

The adhesive of the Samsung Galaxy A51 is very strong. You can use a hair dryer or a heat gun if you aren't able to open the device with the iOpener.

Be careful not to overheat the phone—the AMOLED display and internal battery are both susceptible to heat damage.