You actually got almost all the way through successfully — the failure is happening at the very last stage when mtkclient tries to process seccfg.
Let’s break down what happened.
---
✅ What Worked
From your log:
Device detected in BROM mode
Chip identified: MT8168
DA stage 1 uploaded ✅
DRAM setup passed ✅
Stage 2 uploaded ✅
eMMC detected correctly ✅
DA SLA disabled ✅
So communication, loader, and memory setup are fine.
---
❌ Where It Broke
The crash happens here:
XFlashExt - Detected V4 Lockstate
...
Unsupported ctrl code
...
TypeError: 'bytes' object cannot be interpreted as an integer
The exact failure:
TypeError: 'bytes' object cannot be interpreted as an integer
Inside:
hwcrypto_sej.py → hw_aes128_cbc_encrypt → SEJ_V3_Init
---
🔎 What Went Wrong
1️⃣ You're dealing with V4 seccfg
XFlashExt - Detected V4 Lockstate
This is important.
Your device is using a newer SECCFG format (V4), but:
The loader (DA_MT8168.bin) likely doesn't fully support that format
Or your mtkclient version doesn’t properly handle V4 crypto calls
---
2️⃣ Unsupported Control Codes
XFlashExt - [LIB]: Unsupported ctrl code
This means:
The DA you supplied does not support the command mtkclient is sending for V4 seccfg handling.
---
3️⃣ The Python Error
The crash:
TypeError: 'bytes' object cannot be interpreted as an integer
This is a bug in mtkclient, not your wiring or connection.
It happens because:
The SEJ crypto engine returned unexpected data
mtkclient tried to treat raw bytes as a 32-bit register value
The function expected an integer but received a bytes object
So it’s a software mismatch issue.
---
🎯 Why This Happens
Common causes:
✔ Using an incompatible DA loader
Not all MT8168 DAs work with all firmware versions.
✔ Device has newer security patch
Some MT8168 devices ship with:
New V4 seccfg format
Different crypto handling
Additional protections
✔ Outdated mtkclient version
Older versions do not fully support V4 seccfg decryption.
---
🔥 Important Clue
SBC enabled: True
Mem read auth: True
Mem write auth: True
Cmd 0xC8 blocked: True
This device has:
Secure Boot enabled
Memory authentication required
Some commands blocked
So this is a properly secured device.
---
💡 What You Should Try
1️⃣ Update mtkclient to latest version
git pull
pip install -r requirements.txt --upgrade
Some newer commits fix V4 parsing issues.
---
2️⃣ Try without --stock
Instead of:
python3
mtk.py da seccfg unlock --stock ...
Try:
python3
mtk.py da seccfg unlock --loader DA_MT8168.bin --preloader preloader.bin
Sometimes stock flag interferes with V4 handling.
---
3️⃣ Try a different DA for MT8168
Some MT8168 devices require:
Vendor DA
Matching firmware DA
Factory DA
Generic DA doesn’t always work with V4.
---
4️⃣ Try using --bypass first
Some devices need:
python3
mtk.py payload
Then run seccfg unlock.
---
🧠 Bottom Line
Nothing is wrong with:
Your cable
Your BROM entry
Your handshake
Your DRAM
Your DA upload
The failure is:
> ❗ A crypto / seccfg V4 parsing incompatibility between your device and mtkclient.
---
If you want, tell me:
Exact tablet/phone model
Android version
Security patch level
And I can tell you whether this MT8168 is currently unlockable via mtkclient or not.