[Redmi Note 9 Guides, News, & Discussion] VD171:
WARNINGS

:​

NEVER

try to flash in "

format all

" mode ! Otherwise, you will

LOSE

all secure and identifying infos for your device. Like IMEI.

Keep your backup files safe and secure ! If you can, encrypt them.

Never

try to share your backups or your security and privacy will be compromised.

USE AT YOUR OWN RISK. I AM NOT RESPONSIBLE FOR YOUR ACTIONS.​

Why to backup ?

If you backup the partitions listed here, you can avoid mistakes without risking all of your device's identification details.

Like IMEI, WiFi MAC, Bluetooth MAC, calibration data, NVDATA, NVRAM, RADIO/MODEM/BASEBAND and others.

How to backup ?

You can backup using TWRP, PBRP, DD, SP Flash Tool or anyway you want.

How to restore ?

You can restore using TWRP, PBRP, DD, SP Flash Tool or anyway you want.

I suggest you to use same tool of backup.

Partition: frp​

Description: This partition stores persistent data for factory reset protection. Like google account and miaccount/micloud.​

Size: 1.024 KiB (1 MiB)​

Block: /dev/block/mmcblk0p5​

Start address: 0x5508000​

Length: 0x100000​

View attachment 5213285​

Partition: md_udc​

Description: This partition stores master keys for encrypting and decrypting files.​

Size: 23.144 KiB (22,6 MiB)​

Block: /dev/block/mmcblk0p9​

Start address: 0x6e08000​

Length: 0x169a000​

View attachment 5213283​

Partition: nvcfg​

Description: This partition stores variable configs of NVDATA and NVRAM.​

Size: 32.768 KiB (32 MiB)​

Block: /dev/block/mmcblk0p11​

Start address: 0xa4a2000​

Length: 0x2000000​

View attachment 5213269​

Partition: nvdata​

Description: This partition stores variable data of secure and identifying infos for your device. Like IMEI, WiFi MAC, Bluetooth MAC, calibration data and others.​

Size: 65.536 KiB (64 MiB)​

Block: /dev/block/mmcblk0p12​

Start address: 0xc4a2000​

Length: 0x4000000​

View attachment 5213267​

Partition: nvram​

Description: This partition stores persistent data of secure and identifying infos for your device. Like IMEI, WiFi MAC, Bluetooth MAC, calibration data and others.​

Size: 65.536 KiB (64 MiB)​

Block: /dev/block/mmcblk0p21​

Start address: 0x19f00000​

Length: 0x4000000​

View attachment 5213265​

Partition: persist​

Description: This partition stores persistent data for factory reset protection. Like google account and miaccount/micloud.​

Size: 49.152 KiB (48 MiB)​

Block: /dev/block/mmcblk0p13​

Start address: 0x104a2000​

Length: 0x3000000​

View attachment 5213263​

Partition: proinfo​

Description: This partitions stores persistent data of default structure for NVRAM/RADIO/MODEM/BASEBAND.​

Size: 3.072 KiB (3 MiB)​

Block: /dev/block/mmcblk0p19​

Start address: 0x18200000​

Length: 0x300000​

View attachment 5213261​

Partition: protect1 (or protect_f)​

Description: This partition stores variable data of SIM/RADIO/MODEM/BASEBAND settings and infos.​

Size: 8.192 KiB (8 MiB)​

Block: /dev/block/mmcblk0p15​

Start address: 0x164a2000​

Length: 0x800000​

View attachment 5213259​

Partition: protect2 (or protect_s)​

Description: This partition stores variable data of SIM/RADIO/MODEM/BASEBAND settings and infos.​

Size: 11.640 KiB (11,36 MiB)​

Block: /dev/block/mmcblk0p16​

Start address: 0x16ca2000​

Length: 0xb5e000​

View attachment 5213257​

Partition: seccfg​

Description: This partition stores the state of the bootloader. (Locked or Unlocked.)​

Keep atention:

If you backup this partition in locked bootloader, it will keep locked after restoring. If you want to backup this partition in unlocked bootloader, you need to unlock bootloader first.​

Size: 8.192 KiB (8 MiB)​

Block: /dev/block/mmcblk0p17​

Start address: 0x17800000​

Length: 0x800000​

​

:unsure: Do you need help with your MERLIN device ?

Read this FAQ

: https://xdaforums.com/t/faq-guide-h...for-merlin-redmi-note-9-redmi-10x-4g.4225163/