The AC2100 brush machine is brushed into bricks, the light does not turn on, and the TTL flash machine does not respond

Problem diagnosis

• Bootloader (U-Boot) corrupted - the wrong breed file may have been flashed or the flashing process was interrupted
• NAND Flash Memory Problem - The AC2100 uses NAND flash memory (non-SPI), which is difficult for programmers to save bricks
• hardware damage - Power supply or motherboard failure (to be ruled out first)

Brick rescue plan (in order of difficulty)

Option 1: Check the basic hardware (required)

1. check the power adapter - try replacing the 12V/1.5A power supply to troubleshoot the power supply
2. check TTL connection - confirm TX/RX missed, baud rate tries 57600 and 115200
3. Shorted Flash Pin Method - Try to shorten a specific pin of NAND Flash to force it into programming mode (need to be disassembled)

Scheme 2: Programmer Rescue Brick (Most Effective)

• RT809H or SVOD programmer (NAND supported)
• Heat Gun (Desoldering Flash Chip)
• technical foundation: need to remove the Flash chip and rewrite it with a programmer Bootloader

• NAND flash programmer is expensive (a few hundred yuan), and maintenance costs need to be weighed
• can find a professional repair shop to brush on your behalf, and the cost is about 30-50 yuan

Option 3: Hard Modification of Flying Line (Advanced)

• flying wire connection to the programmer to read and write directly
• replace the same model NAND Flash chip

Important Reminders

1. AC2100 vs Redmi AC2100 Difference :
   • the two breed files are not common and the wrong brushing will lead to brick machines
   • Xiaomi AC2100 model R2100, Redmi AC2100 model RM2100
2. common mistake :
   • flashing the wrong version of breed (e.g. breed with R3G)
   • power loss during flashing
   • NAND bad block causing write failure
3. Prevention Recommendations :
   • Be sure to check for bad pieces before
     brushing
   • use the officially recommended breed version (R1286 or R1338)