If it's an Asian fw 1350, the first dl link in Post #1, i.e. 1420_type2001271 [picture size 190 x 210 pixels] for 1250 will be ok although any other than MY/SG may need the JCV file unlocked/patched. The 1250 displays image size up to 320 x 240 pixels, but 13xx is capable of displaying larger picture size up to 480*272 JCV files so the other JCV file 212*234 should be fine too, however the largest split file 400*366 probably won't work at all.
If it's a US/EU firmware model 1350 with modded splash don't bother with the JCV files as even the parched one won't work in it.
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