Galaxy M31 is the new mid-range smartphone from Samsung. Lunched with One UI 2.0 (Android 10) out of the box, the phone recently received a software update with April 2020 security patch (build M315FXXU1ATD1). After installing the OTA update, many Galaxy M31 units stop booting. Samsung comes up with a quick recovery method for the bricked Galaxy M31. If your phone is in download mode, black screen, or any other mode after the April 2020 update, then here’s how to fix it. (source)

Recover non-booting Galaxy M31

Your Galaxy M31 should boot and return to home screen. All the data on your phone remain intact. Galaxy M31 is one of the best mid-range devices from the OEM. It features a 6.4-inches Super AMOLED display, 64MP quad-camera setup on the back, and 16MP HDR camera on the front. Regarding the processor, Galaxy M31 features Exynos 9611 (10nm), and it is available in 128 GB storage and 6GB RAM option (UFS 2.1). The phone also features a massive 6000mAh battery and supports 15W fast charging.