Edit the BCD timeout to 0.
bcdedit /timeout 0
This skips the OS selection screen, shaving 3-30 seconds off the boot process. In the context of mobile booting, every second counts.
Flash the image to the eMMC boot partition using fastboot with verification. bootemmcwin to bootimg extra quality
fastboot flash boot_a boot.img.extra_quality
fastboot set_active a
fastboot reboot
To verify integrity, check the CRC:
fastboot getvar all | grep crc
Never flash a converted boot.img if you are on a different device model or a different Android version than the backup. TWRP backups are device-specific. A corrupted boot image is the fastest route to a bootloop. Edit the BCD timeout to 0
TL;DR: Rename is wrong. Restore via TWRP, then back up without compression to get a pristine boot.img. Use dd for perfection.
Have a brick recovery story? Let us know in the comments below! This skips the OS selection screen, shaving 3-30
Here’s a technical deep-dive into the concept of converting bootemmcwin images into high-quality boot.img files — a process relevant to Windows-on-ARM devices, custom Android ROMs, and UEFI-based bootloaders.