# Method A: Hardware (Testpoint) - not covered here # Method B: Software via fastboot (rare on Samsung) # Method C: USB 9008 short after battery disconnect import usb.core import usb.util
This content is written for educational and reverse-engineering purposes. It assumes you are developing a tool for legitimate device recovery (e.g., unlocking a decommissioned corporate device with proper authorization). 1. Technical Overview Samsung devices (particularly Snapdragon variants) enforce MDM (Mobile Device Management) locks via Knox. When standard factory reset fails, EDL (Emergency Download Mode) provides low-level firehose access to the GPT and secure partitions. samsung mdm unlock tool - edl mode
for part in targets: if part in partitions: print(f"[*] Reading part") data = fh.read_partition(part, offset=0x0, size=0x10000) # Method A: Hardware (Testpoint) - not covered
# After firehose handshake fh = FirehoseClient(dev) partitions = fh.get_partition_list() targets = ["persist", "efs", "misc", "param", "persist-lg"] A simple replacement triggers anti-tamper
# Search for MDM flag strings (e.g., "MDM_LOCK=1") if b"MDM_LOCK" in data: print(f"[!] MDM flag found in part") patched = data.replace(b"MDM_LOCK=1", b"MDM_LOCK=0") fh.write_partition(part, patched, offset=0x0) Samsung stores an SHA256 hash alongside the flag. A simple replacement triggers anti-tamper. Use:
python samsung_mdm_unlock_edl.py --loader same.bin --restore backup/persist_*.bin Or via manual firehose: