Default [Q] Expert needed - busybox reverts to old version on reboot

Hi, I got a serious problem with busybox, I use stericson installer as that is whats recomended by xda - installation goes fine as you can see on attached screenshots,* but after reboot busybox is reverted to the old version, and I can start over installing again. I tried to install to /system/bin instead, but it didn't help.
I even mounted system as r/w to see if that was the problem, it didn't help.

I have got an unknown MINAMI Allwinner A20 1.2Ghz dualcore tablet with 1Gb ddr3 Ram, 8Gb rom, 7" display with 1024*600', HDMI, Micro USB OTG host, dual cam, wi-fi, power and back buttons, vol+/- soft buttons, stock recovery (3e), jellybean 4.2.2, pre-rooted from factory.

I have no idea if the bootloader is unlocked or not, as I can't seem to find any expert that can tell me how to find out. And believe me, I have searched for that all over the net and in several different forums.

So, I'm asking if you can help me getting busybox to stick to the new version 1.22.1?

With kind regards

JBJ
ps. should I revert system to r/o or is it ok to leave as r/w - what is the pros/cons?
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