Patching error

i flashed my phone with FS+main and the custpack and it worked fine , now when i try to apply .vkp patch i get this error :
ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
Trying to launch embedded bootloader...
embedded flashloader not responds !
Elapsed:44 secs.

plus the SEUS cant identify my phone anymore , what should i do ?? thnx

do you flash Your phone with quick access? it's cid52, so it probably is db2020, right?

remove and reinsert battery
press identify on setool
press 2+5 and insert cable

read patching tutorials since i'm sure you made some mistakes

you must use quick acsse patch or by pass db2020
read topic abuot db2020 patch