When I installed Flash Player (4-5 months back) I did following steps and libs never deleted. They are still there in /data/data/adobe whatever/lib/(here) yet today.
Put those two *.so files in folder, give permissions or don't give. Doesn't matter due to next step. Shutdown immediately and boot in recovery. Flash CWM if you have stock. Go to advanced. Select fix permissions and wait till it completed. Then reboot. Files will stay after reboot.
Also you need flash compatible ROM.
Sent from my GT-S5360 Gadget of Mass Destruction by xda-app
using CWM........Busybox commands........ No I use my hands