debrand w810i

[japan6]

I would sugest you stick with R4EA031, so just grab a GENERIC_MAIN for that firmware version. Hope that its a cid 49 because it is deffinitly the most customizable firmware version (if not your going to have to get a CID50 GENERIC_MAIN). Then just take a look at the Languages Description page here and pick a FS that has the languages that you want. All you need to do then is to download a suitable custpack that goes with the FS. Then just upload them all to your phone and your done. I assume you know how to do that already since you have already debranded your w580i