This report details the significance of the "1662 patched" status for Sony Ericsson (and legacy Xperia) devices, a term historically used in the modding community to describe a specific security hardening that prevents traditional bootloader unlocking. 1. What is the "1662 Patch"?
In the context of Sony Ericsson devices, "1662" typically refers to a specific manufacturing date code (Year 2016, Week 62 - often representing a transition period in hardware/software security) or a security patch version.
Pre-Patch: Older devices could often be unlocked via standard "Testpoint" methods or simple software exploits that bypassed carrier restrictions.
The Patch: Devices marked as "1662 patched" (or similar later versions) have updated bootrom or bootloader security that closes these hardware exploits. This means they can no longer be unlocked through "simpler" methods like the widely used S1 Unlock Tool. 2. Unlocking and Relocking Challenges Status for "1662 Patched" Devices Bootloader Unlock Allowed
Often shows as "No" in the Service Menu (*#*#7378423#*#*). If it says "No," official Sony methods will not work. Testpoint Method se bootloader unlocking relocking 1662 patched
Generally disabled or fixed by the patch, making hardware-level bypassing significantly more difficult. Relocking
For devices that could be unlocked, relocking is often done to restore DRM keys (needed for camera enhancements like X-Reality) or to re-enable official Sony Software Repair tools. 3. Current Workarounds and Risks
For modern Xperia or legacy Sony Ericsson users facing this patch:
Official Unlock: Check the Sony Developer Portal to see if your IMEI is eligible. If "Bootloader unlock allowed" is No, Sony will not provide an unlock code. This report details the significance of the "1662
Third-Party Services: Some specialized tools (like paid S1 server credits) occasionally find new exploits for patched devices, though availability is inconsistent.
Risks: Unlocking (if possible) triggers a factory reset, erasing all data, and may permanently break DRM-related features unless a TA-partition backup is made beforehand.
Pro-Tip: If you are buying a used Sony device for modding, always check the Service Menu first. If "Bootloader unlock allowed" says No, the device is likely "patched" and cannot be easily customized. Se Bootloader Unlocking Relocking 1662 Patched
Certain Telegram and Chinese vendors offer "Authorized Unlock services." They use leaked authorized reseller accounts to generate unlock tokens. Cost: $20-$50 USD. Success Rate: 60% (Often fails with 1662 if
SE here doesn’t stand for Samsung Experience or Sony Ericsson. In bootloader contexts, “SE” often refers to Secure Element or Security Extension—essentially, the part of the bootloader that enforces verified boot (AVB) and rollback protection.
“SE unlocking” is a deeper unlock than the standard fastboot oem unlock. It may involve:
This type of unlock is rarely official. It’s typically achieved using leaked factory tools, patched bootloader binaries, or hardware exploits (e.g., EDL firehose loaders).
Common workarounds (varies by model and Android version):
⚠️ None of these work on the latest Samsung security patches (2023+ for most models).