How to use
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npx skills add https://github.com/hyperb1iss/hyperdroid-skill --skill android-fastbootBefore you start
- Installation does not include a model subscription, API allowance or permission to access your files.
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Original skill document
Rendered from the source repository. Headings, examples, code, tables, links, and referenced images are preserved.
Android Fastboot Operations
⚠️ DANGER ZONE - Fastboot operations write directly to device partitions. Wrong images or interrupted operations can brick devices. Always verify:
- Correct device (check
fastboot getvar product) - Correct images for exact device model
- Bootloader is unlocked (for flashing)
- Battery > 50%
Entering Fastboot Mode
bash
# From ADB (device running)
adb reboot bootloader
# Hardware buttons (most devices)
# Power + Volume Down (hold until fastboot screen)Basic Commands
bash
fastboot devices # List connected devices
fastboot getvar all # All device variables
fastboot reboot # Reboot to system
fastboot reboot bootloader # Stay in bootloader
fastboot reboot recovery # Boot to recovery
fastboot reboot fastboot # Boot to fastbootd (Android 10+)Check Before Flashing
bash
# ALWAYS run these first
fastboot devices # Verify connection
fastboot getvar product # Verify device model
fastboot getvar unlocked # Must be "yes" for flashing
fastboot getvar current-slot # Know current A/B slot
fastboot getvar battery-level # Should be > 50Bootloader Unlocking
Google Pixel
bash
# 1. Enable OEM unlocking in Developer Options
# 2. Boot to fastboot
adb reboot bootloader
# 3. Unlock
fastboot flashing unlock
# 4. Confirm on device with volume keys + power
# WARNING: This wipes all data!Other Manufacturers
| Brand | Process |
|---|---|
| OnePlus | fastboot oem unlock |
| Xiaomi | Mi Unlock Tool (waiting period) |
| Samsung | Uses Odin, not fastboot |
| Motorola | Request code from website, fastboot oem unlock <code> |
| Sony | Request code from website |
Check Unlock Status
bash
fastboot getvar unlocked # yes/no
fastboot getvar device-state # locked/unlocked
fastboot getvar unlock_ability # Can be unlocked?Flashing Partitions
Individual Partitions
bash
fastboot flash boot boot.img
fastboot flash recovery recovery.img # Non-A/B only
fastboot flash dtbo dtbo.img
fastboot flash vbmeta vbmeta.img
# Disable verification (for custom ROMs)
fastboot flash --disable-verity --disable-verification vbmeta vbmeta.imgBootloader & Radio (Extra Careful!)
bash
# These can hard-brick if wrong!
fastboot flash bootloader bootloader.img
fastboot reboot bootloader # REQUIRED after bootloader flash
fastboot flash radio radio.img
fastboot reboot bootloader # Recommended after radio flashTemporary Boot (No Flash)
bash
# Test before committing - reboots to normal after restart
fastboot boot recovery.img
fastboot boot patched_boot.imgA/B Slot Devices
Modern devices have two copies of each partition (A and B).
bash
# Check current slot
fastboot getvar current-slot # Returns: a or b
# Set active slot
fastboot set_active a
fastboot set_active b
# Flash to specific slot
fastboot flash boot_a boot.img
fastboot flash boot_b boot.img
# Flash to both slots
fastboot --slot=all flash boot boot.imgDynamic Partitions (Android 10+)
Large partitions (system, vendor, product) live inside a "super" partition.
Fastbootd Mode
bash
# Enter userspace fastboot
fastboot reboot fastboot
# Check if in fastbootd
fastboot getvar is-userspace # Should return: yesFlash Dynamic Partitions
bash
# Must be in fastbootd mode!
fastboot reboot fastboot
fastboot flash system system.img
fastboot flash vendor vendor.img
fastboot flash product product.imgVirtual A/B Snapshots
bash
# Check snapshot status
fastboot getvar snapshot-update-status
# Cancel stuck update (CAREFUL!)
fastboot snapshot-update cancelRecovery Operations
Enter Recovery
bash
adb reboot recovery
# Or: Power + Volume Up (varies by device)ADB Sideload
bash
# 1. In recovery, select "Apply update from ADB"
# 2. Run:
adb sideload update.zipFlash Custom Recovery (TWRP)
bash
# Test first (temporary boot)
fastboot boot twrp.img
# If it works, flash permanently
# Non-A/B devices:
fastboot flash recovery twrp.img
# A/B devices (recovery in boot):
fastboot flash boot twrp.imgMagisk (Root)
Installation
bash
# 1. Extract boot.img from your firmware
# 2. Transfer to device, patch with Magisk app
# 3. Pull patched image
adb pull /sdcard/Download/magisk_patched_*.img
# 4. Flash patched boot
fastboot flash boot magisk_patched_*.img
# 5. Reboot
fastboot rebootUseful Magisk Commands (after rooted)
bash
adb shell su -c "magisk --version"
adb shell su -c "resetprop ro.debuggable 1"Factory Reset / Wipe
bash
fastboot erase userdata # Wipe user data
fastboot erase cache # Wipe cache (if exists)
fastboot -w # Format data + cache
# Full flash with wipe
fastboot -w flashall
fastboot -w update image.zipDanger Levels
| Level | Operations |
|---|---|
| ✅ SAFE | devices, getvar, reboot, boot (temp) |
| ⚠️ MEDIUM | flash boot/recovery/dtbo, set_active |
| 🔴 HIGH | flash system/vendor, erase, -w |
| ☠️ CRITICAL | flash bootloader, flash radio, flashing lock with custom OS |
Brick Prevention
Never:
- Flash images from different device models
- Interrupt a flash operation
- Lock bootloader with custom ROM installed
- Flash bootloader/radio without matching versions
Always:
- Verify device with
fastboot getvar product - Keep stock images available for recovery
- Use
fastboot bootto test beforefastboot flash - Maintain battery > 50%
Recovery from Soft Brick
bash
# 1. Enter fastboot (Power + Vol Down)
fastboot devices
# 2. Flash stock boot
fastboot flash boot boot.img
# 3. For dynamic partitions
fastboot reboot fastboot
fastboot flash system system.img
fastboot flash vendor vendor.img
# 4. Wipe if needed
fastboot -w
# 5. Reboot
fastboot rebootFor hard bricks (no fastboot access), you need EDL mode (Qualcomm) or manufacturer service tools.
Quick Reference
| Task | Command |
|---|---|
| Check connection | fastboot devices |
| Device info | fastboot getvar all |
| Unlock bootloader | fastboot flashing unlock |
| Flash boot | fastboot flash boot boot.img |
| Test recovery | fastboot boot twrp.img |
| Current slot | fastboot getvar current-slot |
| Switch slot | fastboot set_active a |
| Wipe data | fastboot -w |
| Reboot | fastboot reboot |
