known covered model:
- Nokia 2 E1M
- Nokia 2.1 E2M/EVW (incl. Verizon variant)
- Nokia 3.1 ES2
- Nokia 3.1 USA EAG (AT&T/Cricket TA-1140/1141)
- Nokia 3.1 Plus ROO
- Nokia 3.1 Plus C RHD (Cricket TA-1124)
- Nokia 5 ND1
- Nokia 5.1 CO2
- Nokia 5.1 Plus PDA
- Nokia 6 D1C/PLE
- Nokia 6.1 PL2
- Nokia 6.1 Plus DRG
- Nokia 6.2 SLD (Downgrade to Android 10 is required if you still have Android 11 running, no publicly downgrade method available)
- Nokia 7 C1N
- Nokia 7.1 CTL
- Nokia 7 Plus B2N
- Nokia 7.2 DDV (Downgrade to Android 10 is required if you have Android 11 running, downgrade guide)
- Nokia 8 NB1
- Nokia 8 Sirocco A1N
- Nokia 8.1 PNX
- Nokia 9 PureView AOP
- Nokia X71 TAS
- Sharp Aquos S2 / C10 SS2/SAT
- Sharp Aquos S3 / D10 HH1/HH6/SD1
- Sharp Aquos S3 mini SG1

Following models already have bootloader unlock guide publicly available:
- Nokia 1, 1 Plus and 3 (FRT, ANT and NE1)
- Nokia 2.2, 2.3 and 2.4 (WSP, IRM and WVR)
- Nokia G10 and G20
(We recommend you use MTK Client on models above to bootloader unlock for saving your efforts)
- Nokia 3.2 and 4.2 (DPL/PAN) (Verizon variant is unsupported)
- Nokia 8.3 5G (BGT) (Verizon variant TA-1257 is unsupported)

Just a new update, We've enabled "topic" feature in our group.

To allow you chat further, you should update your Telegram to following versions:
Desktop PC (Windows / macOS / Linux): 4.2.4 or newer
Android: 9.1.3 or newer

- Telegram app downloaded from Microsoft Store is outdated
- You can't use web version and Telegram X yet
- We cannot guarantee other unofficial Telegram app will work

To check old chat records before this being implemented, please click on menu and choose "View messages".

Changelog of HCTSW Care UU4 v1.6a:
1. Fixed the issue the tool will crash if you attempt to run it at directory contains bracket (e.g. New Folder (2) ).
Now the tool will prompt you if detected.

2. Fixed the issue where unlocking the bootloader of Nokia 8.1 / 9 PureView will not have the unlock guidance message appear.

3. Fixed the issue where Sharp Aquos S3 mini cannot be bootloader unlocked properly.

4. Add support for Nokia 8.3 5G (you don't need to request bootloader unlock on our website). Support for 6.2 and 7.2 will be added later.

Other notes:
Windows 7 and Windows 8 support will be dropped by Microsoft in 2023, and we cannot guarantee it will run on those older OS.
If you see strange error message (xxxxx.dll missing), please upgrade to Windows 10 or newer.

UU4 1.6a 更新日志：
1. 修复了工具在包含括号的路径下运行时会崩溃的问题。现在工具检测到路径包含括号就会提示用户移出带有括号的路径。

2. 修复了 Nokia 8.1 X7 和 9 PureView 两款机型解锁 bootloader 时不提示的问题。

3. 修复了 Sharp Aquos S3 mini 无法正确操作的问题。

4. 新增对 Nokia 8.3 5G 的支持（无需在我们的网站申请服务）。今后将会加入 Nokia 6.2 和 7.2 的支持。

其它注意事项：
微软将于 2023 年彻底结束 Windows 7 和 Windows 8 支持，我们不保证该工具仍然可以在旧版本的 Windows 下运行。
如果您在使用过程中遇到如 xxxxx.dll 丢失的错误提示，请更新到 Windows 10 或更高版本的操作系统。

HCT Multi-function API Server Maintenance Notice

We plan to migrate the API server (api.hikaricalyx.com) out of wikihost and switch to AWS starting from 20:00 (UTC+8) on December 24, 2022.

Estimated Time: 2 hours
Affected Services:
- HCTSW Care UU4
- OSTRemote2 Client and DKRemote Client
- Anti WeChat Browser API

Thank you for your support!

Maintenance has ended.

Hi all,
Due to incoming Chinese Lunar New Year, our remote service will be temporarily suspended until January 31st.
Self-operation services (including bootloader unlock) aren't affected.

Thank you.

HCTSW Care UU4 v1.6a Rev2 package update:

- Added ResetEnvironment.reg for repairing corrupted environment variables.
We noticed some users corrupted environment variable caused the tool doesn't run properly.

In case that happens, you can import ResetEnvironment.reg to fix it.
Note, doing this will cause all your configured environment variable located at "Path" being erased, this may include VS Code, Python, etc.

Only use it when you find the tool crash immediately.

It will be placed at "Troubleshoot" directory of UU4 package.

Chinese:

我们注意到一些顾客反馈说该工具无法正确运行，会直接崩溃。
检查发现是环境变量PATH编写不规范导致的崩溃，因此我们更新了 ResetEnvironment.reg 以修复此问题。

如果发现解锁工具无法正常运行，请导入该注册表项目。
注意，导入之后，会导致你对 Path 用户变量和系统变量做出的任何修改全部丢失，例如如果你将 Python 添加到 PATH 了，导入该注册表信息后会导致无法再从命令行直接运行 Python，必须重新安装。

请只在 UU4 崩溃的时候再来使用。

该文件将会放置在 Troubleshoot 目录。

Mail service migration notice

We will perform mail service migration during Feb 18 9:00 (UTC+8) to Feb 19 9:00 (UTC+8).
Mail service will be migrated from Hostinger to AWS.

How will this migration affect you?
- You won't be able to send/receive mails to/from hikaricalyx (at) hikaricalyx (dot) com until migration ends
- You won't be able to receive mails from no-reply (at) hikaricalyx (dot) com until migration ends

Thank you for your support in past 8 years!


邮箱服务迁移通知

我们将于2023年2月18日09:00 UTC+8 - 2023年2月19日09:00 UTC+8期间将邮箱服务从 Hostinger 迁移到 AWS。

这次迁移计划会带来怎样的影响？
- 迁移结束前，您将无法往我们的邮箱发送邮件，也无法接收来自我们邮箱的邮件。

感谢您8年以来的支持！

Following services will be discontinued after June 1, 2023:

- paid bootloader unlock service
- phone remote flashing service
- carrier lock unlock service

Bootloader unlock service for supported phones will be available for free after June 1.

However, troubleshooting with remote operation will be paid.

Kernel sources are gone.
TCC is betraying community.

You can still have kernel source packages downloaded from the Internet Archive. Hurry up before it's too late!

https://web.archive.org/web/20221211012230/https://www.nokia.com/phones/en_int/opensource

Due to server IP address changing, you may encounter API server inaccessible issue in next few hours.
IP address change will take effect in at most 2 hours, depends on DNS server.
If you're in hurry, please change hosts as follows:

52.79.210.76 api.hikaricalyx.com

Warranty Lookup service is updated.
Now you can only check warranty status in every 30 seconds.

https://warranty.hikaricalyx.com

To HP Elite x3 owners:

Now you can install Android into HP Elite x3!

Telstra and Verizon variants are untested, do it at your own risk.

https://forum.xda-developers.com/t/guide-how-to-install-android-to-hp-elite-x3.4565837/

We plan to migrate existing bootloader unlock tool into GUI.
So, the next version will be UU4 2.0.

Since 2.0, python 3.9.x installation is now required to run UU4 2.0.
We cannot guarantee it will run on Python 3.0-3.8, 3.10 or newer.

Please download Python 3.9.13 installer from here: https://www.python.org/downloads/release/python-3913/

Windows users should use "Windows installer (64-bit)" instead of embeddable package. We may bundle Python 3.9.13 for 64bit Windows into the package.

UPDATE: Fixed as of 2:30 UTC

The upstream server sts.c2dms.com is currently down.
We don't know when FIH Mobile will fix it yet.

Affected services:

- HCTSW Care UU4
- OSTRemote 2 online usage

It may also affect other tools by other developers that rely on c2dms server.

We've received feedback from users that the firmware cannot be downloaded properly from AFH.
So, here's Nokia 2.2 firmware for bootloader unlock.