Bootloader | Cheatsheet¶

A bootloader is a vendor-proprietary image responsible for bringing up the kernel on a device. The bootloader guards the device state and is responsible for initializing the Trusted Execution Environment (TEE) and binding its root of trust. The bootloader also verifies the integrity of the boot and recovery partitions before moving execution to the kernel.

OEM¶

Print lock state¶

fastboot oem device info

Check secure image for bootloader¶

fastboot oem check-image

Unlock bootloader¶

fastboot oem unlock <key>

Check state for FB¶

fastboot oem lock-state info

Dump status for bootloader¶

fastboot oem get-bootinfo

Get root status¶

fastboot oem check-rootinfo

Relock bootloader¶

fastboot oem relock

Erase Factory Reset Protection¶

fastboot oem frp-erase

Unlock Factory Reset Protection¶

fastboot oem frp-unlock

Run emmc diagnostic¶

fastboot oem emmc_diag

Dump eMMC info¶

fastboot oem emmc-dump

Print key version¶

fastboot oem get_key_version

Dump battery status (millivolts)¶

fastboot oem battery_present_check

Print hwnff version¶

fastboot oem get_hwnff_ver

Print IMEI and serial number¶

fastboot oem get-psid

Print firmware model¶

fastboot oem get-build-number

Print firmware build¶

fastboot oem get-product-model

Print devices connected in fastboot¶

fastboot devices

Get Variable Product¶

Print device info¶

fastboot getvar all

Print kernel¶

fastboot getvar kernel

Print bootloader version¶

fastboot getvar version-bootloader

Print product¶

fastboot getvar product

Print device board¶

fastboot getvar board

Print secure mode¶

fastboot getvar secure

Print hwrev¶

fastboot getvar hwrev

Print radio info¶

fastboot getvar radio

Print storage type¶

fastboot getvar storage-type

Print eMMC info¶

fastboot getvar emmc

Print UFS info¶

fastboot getvar ufs

Print RAM info¶

fastboot getvar ram

Print CPU info¶

fastboot getvar cpu

Print device serial number¶

fastboot getvar serialno

Print CID¶

fastboot getvar cid

Print channel ID¶

fastboot getvar channelid

Dump token¶

fastboot getvar token

Dump device secure state¶

fastboot getvar securestate

Dump device verity state¶

fastboot getvar verity-state

Dump warranty void info¶

fastboot getvar iswarrantyvoid

Dump max download size¶

fastboot getvar max-download-size

Dump reboot reason¶

fastboot getvar reason

Dump IMEI/IMEI2¶

fastboot getvar imei
fastboot getvar imei2

Dump MEID info¶

fastboot getvar meid

Dump factory date device was born¶

fastboot getvar date

Print SKU version¶

fastboot getvar sku

Print carrier SKU¶

fastboot getvar carrier_sku

Dump battery serial¶

fastboot getvar battid

Dump battery voltage¶

fastboot getvar battery-voltage

Dump ICCID¶

fastboot getvar iccid

Dump MD5 value¶

fastboot getvar cust_md5

Dump max sparse size¶

fastboot getvar max-sparse-size

Dump alarm status¶

fastboot getvar poweroffalarm

Dump ro.carrier¶

fastboot getvar ro.carrier

Dump ro.build.fingerprint settings¶

fastboot getvar ro.build.fingerprint

Dump baseband of device¶

fastboot getvar version.baseband

Dump kernel version¶

fastboot getvar kernel.version

Dump git info¶

fastboot getvar git

Dump current slot in use¶

fastboot getvar current-slot

Dump FRP status¶

fastboot getvar frp-state

Dump sim slot¶

fastboot getvar slot-count

Dump booted slot¶

fastboot getvar slot-successful

Dump unbootable slot¶

fastboot getvar slot-unbootable

Dump how many times we gonna boot on active slot before changing¶

fastboot getvar slot-retry-count

Dump logical block size¶

fastboot getvar logical-block-size

Dump erase block size¶

fastboot getvar erase-block-size

Dump status for userspace¶

fastboot getvar is-userspace

Dump pcb number¶

fastboot getvar pcb-part-no

Dump primary/secondary display¶

fastboot getvar primary-display
fastboot getvar secondary-display

Dump status for fdr¶

fastboot getvar fdr-allowed