First of all, take a nandroid backup. Just in case.
- wipe cache,dalvik,system,data (3 times each one)
- wipe dalvik - cache
- clean to install a new rom
Flashing takes 5.5min.
ROM link: https://mega.nz/#!QdRiTQQL!OO6BEVw0F...U-R2UqJNh4no_M
activate developer options, Go to: Select USB Configuration -->MTP
WARNING i fave added the "Volume Booster GOODEV" apk whick upgades external speaker sound USE IT WITH CAUTION!!! (for max performance deactivate audio fx while in speaker mode)