Here is the translation, should better that google translate...
This item is a system unlock service, our service support both US and Japan version of DPT-S1.
Our unlock service is totally reliable. We can perform our risk-free system unlock procedure without tear down or hardware mod.
If you need an unlocked device, please visit
https://item.taobao.com/item.htm?id=522747481985.
Ver 1.5.00 font update package is ready, add support of no-font-embedded chinese pdf file.
1Ver 1.5.00 system update package is ready, customers who got their device unlocked before Oct. 2015, please contact us for this package.
System unlock takes 1~2 days after we received customer's device. If you have specified request, please contact us before put an order.
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Due to technical reasons, customer should ship the device to us. All data should be backup before shipment, because the unlock procedure will wipe all custom data on device. We'll update device to latest firmware version after system unlock.
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DPT-S1's runs an android based OS, which sony has modified to prevent native android operation. This unlock operation will not overide the native OS, what we do is unlock all the android features sony has blocked. So you'll not lost any original features or software shipped with the native OS. Unlock device support subsequent system update.
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Specification of unlocked device :
1. OS: Android 2.2.1
2. Supported file format:txt, epub, doc, mobi, azw3 etc.
3. Japan version support en/jp UI.
4. Install third party android app.
5. Install android email client.
6. Support no-font-embedded chinese pdf files.
Video of typing on DPT-S1:
http://v.youku.com/v_show/id_XODQzNTgwNjQw.html
Hi-PDA forum, threads about DPT-S1 unlock:
Mar. 2014:
http://www.hi-pda.com/forum/viewthread.php?tid=1410374
Sep. 2015:
http://www.hi-pda.com/forum/viewthread.php?tid=1714825