Failed: Fdl2

To fix the error, you must understand what "FDL2" is. FDL stands for Flash Device Loader. It is a secondary bootloader used in Qualcomm’s Emergency Download (EDL) mode. The boot chain looks like this:

When MiFlash or QFIL reports "FDL2 failed" , it means the host PC successfully sent FDL1 to the device, FDL1 loaded into RAM and executed, but when the PC tried to send FDL2, the device either rejected it, crashed, or failed to acknowledge. fdl2 failed

In plain English: Your phone’s brain woke up, stretched, loaded the first mini-program (FDL1), but when the computer tried to send the main flashing tool (FDL2), the phone said, "I can't understand this" or "I have no memory to run this." To fix the error, you must understand what "FDL2" is

Using a tool like intelmetool (Linux) or fpt -desc -d desc.bin, extract the descriptor and parse it to check: When MiFlash or QFIL reports "FDL2 failed" ,

Often, a "soft" EDL (using ADB reboot edl) is unstable. Do this: