Android NV / EFS Partitions Explained - A Complete Reference for Mobile Technicians
Android NV / EFS Partitions Explained - A Complete Reference for Mobile Technicians
Discription : This infographic provides a clear, technician-friendly overview of NV, EFS, and modem-related partitions used across major Android chipsets and brands. It covers Samsung (Exynos, Qualcomm, MTK, Unisoc), Xiaomi, Oppo/Realme, Media Tek, and Huawei/ HiSilicon, highlighting critical partitions like EFS, NVData, NVRAM, modemst, fsg/fsc, protect, oeminfo, and more. Designed as a quick reference, it helps technicians understand where IMEI, serial, network calibration, and modem data are stored, and emphasizes the importance of backup before flashing or repairing to avoid network loss or device damage.
Samsung Exynos (Secure & Stable Architecture)
efs – IMEI
sec_efs – Serial Number
M9KEES1 / M9KEEFS2 – Old models security data
Samsung MediaTek (MTK – Structured NV System)
efs
sec_efs – Serial
nvdata
nvram
protect1
protect2
Samsung Qualcomm (High Security Modem Stack)
efs
sec_efs
fsc / fsg
modemst1
modemst2
MDM9M9KEES1 / MDM9M9KEES2 / MDM9M9KEESC (Old models)
Samsung Unisoc / SPD (Separate NV Layout)
sec_efs – Serial / Dual SIM
vendor_efs – Dual SIM data
MISCDATA
L_FIXNV1 / L_FIXNV2
L_RUNTIMENV1 / L_RUNTIMENV2
PRODNV / ODMKO
Xiaomi Qualcomm (Modem-Centric Design)
fsc / fsg
modemst1
modemst2
mdm1m9kefs1
mdm1m9kefs2
mdm1m9kefs3
mdm1m9kefsc
OPPO / Realme (Qualcomm UFS – Encrypted Layout)
oppostanvbk
oppodevicinfo
opporeserve1
opporeserve2
opporeserve3
modemst1
modemst2
MTK UFS Devices
nvdata
nvram
protect1
protect2
OPPO_RESERVE1
OPPO_RESERVE2
MediaTek (General MTK Platform)
nvram
protect_1 / protect_s
protect_2 / protect_s
proinfo
nvcfg
Huawei / HiSilicon (Kirin – Enterprise-Grade Security)
oeminfo
NVM
MODEMNV_FACTORY
MODEMNV
MODEMNV_BACKUP
modemst1
modemst2
proinfo