A custom recovery is the ultimate tool for an Android user to easily flash/install modified ROMs or system files. It’s the only tool for Android devices to perform a complete system backup and restore. If you’re in for fun on Android, a custom recovery like TWRP is all you need.
Thankfully, developer tonystark88 over at xda has released a build of TWRP recovery for Xperia M4 Aqua. It isn’t an official build from TeamWin (the maintainer of TWRP recovery), but as per the user feedback, the build is flawless and is working great on the device.
However, since this is the first release of TWRP recovery for Xperia M4 Aqua, it isn’t completely functional yet. Like you can’t mount SD Card on this TWRP build, but that shouldn’t be a big deal for most users.
You can grab Xperia M4 Aqua TWRP recovery from the download link below and easily flash it via Fastboot. Make sure you’ve bootloader unlocked on your device.