I've made a brand new 14.5.A.0.270. It's rooted, with recovery and flashable.
I've did a dirty flash on 242 and everything is working. Just remember that the first boot taaaaaaakes loooooooooooong tiiiiiiiiimeeeeee.
For security reasons take a backup before flashing.
I'm not responsible for any data loss or something else. Flash it on your own risk.
[NUT] for recovery
zxz0O0 for PRFCreator
IaguCool for XperiFirm
Chainfire for SuperSU
SONY for ROM
PS: It's my first time I share a ROM. It's not my work, I'm not a DEV. If something is missing here, please tell me.