[GUIDE] How to restore IMEI, Baseband, MAC, fix NVRAM WARNING and fix NVDATA CORRUPTED on MERLIN ? (Redmi Note 9 / Redmi 10X 4G)

[matteo555]

Then inside sp flash i only marked the nvram option and clicked download and everything went okay

this means that, device is now in stock_rom ?

 

[germanargentina]

Warnings:

- This guide requires the backup be done when the IMEI was present!
- 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.

What this guide does ?
- Restores IMEI.
- Restores Baseband/RADIO/Modem.
- Restores Wi-Fi MAC.
- Restores Bluetooth MAC.
- Fixes "NVRAM WARNING: ERR 0x10" error.
- Fixes NV Data corrupted error.
- Fixes unknown baseband.
- Fixes null IMEI.

How to backup ?
You can backup the listed partitions using TWRP, PBRP, DD, SP Flash Tool or anyway you want.
I suggest you to use your favorite tool.

How to restore ?
You can restore the listed partitions using TWRP, PBRP, DD, SP Flash Tool or anyway you want.
I suggest you to use same tool of backup.

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​

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​

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​

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​

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​

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​

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​

Do you need help with your MERLIN device ?
Read this FAQ: https://forum.xda-developers.com/t/...for-merlin-redmi-note-9-redmi-10x-4g.4225163/

Hi! First of all I want to thank you for all your contributions and help you've given to other users with this device

I wish I had read your posts before trying to fix my phone, it updated to MIUI 13 automatically and afterwards it kept turning itself off and randomly rebooting so I tried to flash the stock firmware again with SP Tools: ran into a couple of errors and did some stupid things like connecting the phone to the thunderbolt port instead of the USB ones and also did "Format whole flash except bootloader" but never pressed format all + download, somehow the device survived it all

Whenever I flash MIUI 13 the phone boots to recovery with "NVData is corrupted" message, I was able to unlock the bootloader and downgrade to MIUI 12.5 which apparently works perfectly fine (got wifi mac address, bluetooth, SIM1 is recognized and working for calls data etc) but now both IMEIs are shown as "Unknown" and I still can't update to MIUI 13

I really don't understand how the sim cards are still working, but I'm afraid to try fixing them because afaik the SIM1 is protected by RSA encryption

Do you have any advice for this situation?