Released in 2019, the Samsung Galaxy A40 was a standout in the mid-range market. It offered a Super AMOLED screen, a compact form factor, and a respectable Exynos 7904 chipset. However, as technology moves at a breakneck pace, official software support for the A40 has waned. If you are holding onto this device, you may have noticed it becoming sluggish, or perhaps you are stuck on an older version of Android with the heavily skinned One UI.
Download your chosen ROM and GApps (Google Apps, if not included). Boot into TWRP Recovery. Wipe Data, Cache, and System. Flash the ROM .zip file. Reboot and enjoy! Final Thoughts custom rom samsung a40