So i have bought 3 ip cams ds-2cd233-i all 3 came with different firmware install but all said 5.3.0_150327 on packaging. My question is i upgrades one to 5.3 no probs and of course in chinese. But no matter what i do i cant downgrade back 5.2.5 (which im assuming the chinese can do). Am i correct to say im stuck with 5.3 in chinese or can they be downgraded? when i try to downgrade via tftp firmware supplied via vendor or off internet the process never says system updated completely unless i use the 5.3. all other firmware i use gives me a bricked cam in sadp with v4.0.8 and no dsp info(takes approx 20 mins to b found) Can i downgrade ????? Thanks for your wisedom guys and gals