Reboot your device and wait for it to boot up. You may need to wait a few minutes for the device to optimize the new ROM.
Reboot your device into recovery mode by pressing and holding the Volume Down, Power, and Bixby buttons simultaneously. custom rom for samsung a9 2018
Download the custom ROM of your choice from the official website or a reputable source. Make sure to download the correct version for your device. Reboot your device and wait for it to boot up