"Enter PIN/password to decrypt", "30/30 attempts remaining" topic

hello all,
i bought an lg g3 from ebay used one ,
i got this message when i turned on the phone
"Enter PIN/password to decrypt", "30/30 attempts remaining"
also when i put a sim card i got this message
"this phone is permanently locked and cannot be unlocked "
tried to do factory rest got error
emmc error 150
then tried to flash anew stock rom its stuck at 6%
device D850 at&t LG g3

Regards

xda-developers