I have a rooted Xperia M Dual (C2004) with stock ROM 15.5.A.1.5 (4.3 Jelly Bean). Bootloader unlocking is allowed and I also have the unlock code already.
Since Sony decided to stop giving updates I wanted to install a custom ROM. So went ahead and rooted it but now I'm stuck. I am still on stock ROM because I don't know how to proceed now.
Some threads say to unlock bootloader and flash the ROM, some say to flash the stock ROM first then recovery.
I found this app called TWRP Manager on my device's twrp page( https://twrp.me/devices/sonyxperiam.html ) which has an option to install TWRP. But since my bootloader is still locked I don't know if it's safe.
A guide on XDA has instructions but it says after unlocking bootloader flash the custom ROM which is a huge 700 megabytes download and I at the moment don't have the bandwidth.
So is it possible for me to install TWRP via that app and flash the custom ROM directly? Or what else should I do?