why is this a pre-release in kernel version ??? what does it mean ?

bc 16,000 rupye mein snapdragon 425 lelo wo bhi 1.4gHZ ke processor ke saath ch*tiya kaat rha hai samsung ab to... 藍藍藍[J6 with 1.6 ghZ octa core processor with exynos 7870 aur idhr J6+ 1.4 gHZ quad core processor with SD 425]

wtf is going on !!J6+ launched with 1.4 gHz quad core processor and snapdragon 425While J6 was launched with 1.6 gHz octa core processor and exynos 7870J6+ have IPS LCD displaywhereas J6 comes with Super Amoled display !!they should have make J6+ mor...

J7 prime is getting worst day by day, Fingerprint works slow and sometimes it even doesn't work.While opening google playstore on charging, my device always reboots automatically.Fast battery drainage, very slow charging and charging pauses at 74 or ...