Vivo Y21 PD2139BF After Downgrade October 2023 Security To August 2022 Phone Koi Port Nehi Bana Raha. ISP Se Connect Kiya Toh EMMC Permanent Write Protection: Yes Hain. RPMB Clean Nehi Ho Raha. EMMC Firmware Dump Leke Phir Se Wohi RPMB Se Update Kiya Lekin RPMB Clean Nehi Ho Raha Aur Write Protection Bhi Nehi Ja Raha. Please Sir Koi Solution Bataiyein. Samsung EMMC Hai Isme