Is getting a new android version on my lg g pro lite dual the only solution to ....?

i have a LG G PRO LITE DUAL ( lg g pro lite D686 ) that doesn't have FRENCH as one of the system language ( when you go to settings....>language & input .....> .... there is no option for french, and as a result, i CANNOT change the phone system language to french. i've tried all sort of apps ( locale text, morelocale2, text and locale, etc etc etc ) the only thing that happened was that part of the phone was changed to french, but not the system language. the majority of it is still in english.

I was told that the ONLY way i would be able to add/install/get french as a language on the phone is to either

1- CHANGE THE OPERATING SYSYTEM. the one on my phone is android 4.1.2. i was told that some operating systems like 4.2.2, or 4.4, and even 4.0.2, which i currently have on my htc phone come with french as part of the system language.

or

2- install some kind of custom ROM.

I would really appreciate it if someone out there could help me with either one of those options since I have no clue how to go about accomplishIng any of these things, or if there is another way i can get french on my phone, please let me know as well.

I would even consider making a small donation, if you have paypal to thank you for your time.

some basic info about the phone:

its brand new, unlocked and unused, so i dont have to worry about backing up any data whatsoever.. i plan on shipping it to a french speaking country, which is why i absolutely MUST change it to french.
its an LG G PRO LITE DUAL phone
android version 4.1.2
and its already been rooted.

please help.

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