To understand the repair process, you must first understand the architecture.
The codename earth is shared between the Redmi 12C and Poco C55. Internally, they are identical. This means:
However, here lies the critical warning: You cannot download a working NVData file from a forum (4pda, XDA, GSM-Forum) and flash it to your device.
Why? Because every physical phone has a unique set of calibration data. If you flash someone else's NVData:
Prevention is better than cure. If you use SP Flash Tool on your earth device: Poco c55 or Redmi-12c-earth- NvData NvRam File ...
If you use Mi Flash Tool (Fastboot mode), always select save user data or clean all – never clean all and lock without a backup.
When comparing the Poco C55 and the Redmi 12C, several factors come into play, including display quality, processor performance, camera capabilities, and battery life. Both devices are equipped with features that cater to basic smartphone needs, including social media, web browsing, and casual gaming.
To fix the "dead baseband" issue, a technician uses Maui Meta Tool or UnlockTool:
| Feature | Poco C55 | Redmi 12C |
|--------|----------|------------|
| Model | 22127PC95I (India/Global) | 22120RN86G / 22120RN86I |
| Chipset | MediaTek Helio G85 | MediaTek Helio G85 |
| Board | c55 / earth | earth (same board name) |
| NVData/NVRAM | Critical for IMEI, BT/WiFi MAC, calibration | Same | To understand the repair process, you must first
Key fact: They use the same base firmware (codename earth for Redmi 12C, sometimes c55 for Poco variant). NVData files are not cross-flashable without hex editing because IMEI region lock and calibration data differ.
No — not directly.
Even though the board is the same, the partition signatures are tied to:
If you flash Redmi 12C’s nvram onto a Poco C55, you might get:
Solution: Extract only the calibration region from Redmi 12C’s nvram and patch into Poco’s nvram with hex editor (advanced users only). However, here lies the critical warning: You cannot
The problem with the Redmi 12C and Poco C55 is specific to the SP Flash Tool and Mi Flash Unlock. A technician flashing a "Full Factory" ROM often ticks the wrong box: "Format All + Download."
When you do that on a Mediatek "Earth" device, the bootloader happily obeys. It wipes the NvData partition entirely. You are left with a phone that boots, shows the setup wizard, but reads "No SIM Card" and shows an IMEI of "000000000000000."
You have effectively given the phone amnesia.