The “better” firmware for DS-2CD1021-I is usually not the latest , but the last version before a major platform change (around 5.5.0). If you just want stability and security patches, stick with V5.5.0 build 170710 or similar. Avoid 5.6.x and above unless you know your camera’s exact chipset supports it.
Before you search for a match, you must check your baseline. ds2cd1021i firmware download better
is a staple 2 MP network bullet camera known for its reliability in professional surveillance environments The “better” firmware for DS-2CD1021-I is usually not