Default I9305 Knox bootloader 4.3 to 4.1.2

I just want to know if i can flash 4.1.2 I9305XXBLL3 to 4.3 knox bootloader
I didn't like 4.3 and i want 4.1.2
I don't care about knox 0x1
LG Nexus 5 D821 (16GB)
Samsung Galaxy Note 3 N9005
Samsung Galaxy Tab 3 SM-T311
Samsung Galaxy Pocket Neo GT-S5310
Samsung Galaxy S i9000
Samsung Galaxy Tab 2 P3110
Sony Ericsson K800
Sony Ericsson K750

Speed Test

PLEASE hit THANKS IF I helped you
I am available for testing on these phones. Just send me PM
Any ideea to make my internet connection faster?