error when i select bypass DB2020 security

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:51
Speed:921600
OTP LOCKED:1 CID:51 PAF:1 IMEI:35220701308751 CERT:RED
FLASH CID:51 COLOR:RED
LDR:061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005
Flash ID check:897E
Flash props sent ok
unsupported combination.
Elapsed:5 secs.

try to press "C" button while connecting the phone

Are you trying to patch it? If so then use jdflasher and anycid method.