Luban route stuck on the boot page after swiping U-Boot? A brick-saving note will bring you back to life in place
Routing enthusiast• Publish Time:2025-12-8 10:29• Category: Router settings
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1. Fault phenomenon
after flashing U-Boot (or Breed) for Luban (CreativeBox-CB3), the web background can no longer enter the system, and as soon as the browser is opened, it is the "U-Boot update page" - upload, restart, re-upload, dead loop. TTL serial port observation, it was found that the machine always stopped at
Hit any key to stop autoboot, while the manual bootm prompted Bad Magic Number. This shows that firmware is not actually written in, or written in the wrong place. 2. The reason for 90% of the crater
according to the summary of a large number of netizens, sorted by frequency of appearance:
3. Necessary steps before saving bricks
- disassemble the machine to connect TTL: TX→RX, RX→TX, GND→GND, baud rate 115200.
- power-on maniac presses space to enter the Breed command line (if you see
=>, it is the official U-Boot). - the static IP of the computer network port 192.168.1.2/24, open the tftpd32 firmware directory.
as long as you can see the serial port menu, the machine will be saved; There is no output of the serial port, so the SPI programmer is needed.
4. The three-step method of resurrection in place
STEP-1 Confirm the partition
perform in Breed
part
should see normally
mtd0 0x00000 0x30000 "Bootloader" mtd1 0x30000 0x10000 "Config" mtd2 0x40000 0x10000 "Factory" mtd3 0x50000 0x7a0000 "firmware"firmware must start with 0x50000, otherwise the address you swiped before must be wrong.
STEP-2 Reflashing the firmware
Breed Menu Selection
Firmware Update → General Firmware → Browse → Check immortalwrt-mt7621-creativebox-squashfs-sysupgrade.bin
key points :
- only select the "Firmware" partition, do not manually fill in the address ;
- after the upload is completed, wait 5 minutes for Breed to complete the verification + write + synchronization;
- see
Update completed, rebooting...power off and restart.
STEP-3 Validation Startup
TTL should appear after rebooting
[ 0.000000] Linux version 5.15.xxx [ 0.700000] mt7621_eth: done browser access 192.168.1.1 has become an OpenWrt login page, and you're done.
5. If you still return to the U-Boot page
- Firmware change: immortalwrt, official R1911, Padavan all try once;
- change browser: Chrome uploads large files occasionally TCP Reset, which can be solved by changing Edge/IE;
- Revert U-Boot: If you want to use the official system again, you must first write the official
u-boot-mt7621-68.binback to mtd0, and then flash the official firmware, otherwise it will always prompt that it is not compatible.
Breed Command Line Example:mtd write u-boot-mt7621-68.bin Bootloader reset
6. Summary
"upload 100% ≠ flashing complete" - MT7621 models such as Luban/New Route 3/CR660x, Web-Uboot can easily give people the illusion of "fake success"; As long as TTL can enter Breed, you can operate in the order of "check the partition first→ then brush the firmware→ and wait patiently for 5 minutes", and it can basically be revived in place without the need for chip detachment and programming. I wish you all to light up once and stay away from bricks!
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