pictures resizing too small with official mms.apk !!! on all roms

I have a wiko rainbow.

the native rom when i bought it was android 4.2 jelly beam.
and when i add picture to mms, it's always auto resize in 30kb or 80kb max, however i check 300k max size in settings.
i found a modified native apk which fix this bug.

But this modified apk isn't available on kitkat roms, and not more on loolipop roms.
Which line of text in this mms.apk can I change to correct this problem, in order risizing mode not pass over the settings size max.

Thanks for advance.

i know the better way is to use an other dual sim mms.apk from google store, but no over one is so easy to use for display the 2 sims with operator compagny name. In france my sim1 is called ''orange" and sim2 " freemobile", and i can choose color for each of them
the others apk only display "sim1" or "sim2"

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