[Android General] LuNaTum:
Change dpi and get bluetooth working with android and windows 8.1 at the same time

Do these changes if you are confident in your skills. I'm student and quite busy so if you ask something it can take some time for me to answer. Damages you might do to your system are your own responsibility. I have tested these instructions with Acer W700 on android-4.2.2_r1-ia3 and can confirm that they worked for me.

First changing dpi from original 213 to 160:

1. Get file manager on android like ES file Explorer

2. R/W rights to whole system on android

3. From root go to /system/etc/machine-props/

4. Open acer-w700.prop with ES Explorer and edit line "ro.sf.lcd_density = 213" and change 213 to 160

5. Reboot android and system should now be 160 dpi

Now about that bluetooth. I find it annoying that you have to pair your bluetooth mouse and keyboard again every time when you switch between android and windows 8.1. So I did research and found a way to fix this problem and here's how to do it. I can confirm that this works with Acer bluetooth/cover keyboard and MS Sculpt touch mouse.

1. Pair your bluetooth devices first with android and the with Windows

2. On Windows download PsExec

3.Then from downloaded file copy PsExec.exe in Windows to directory C:\Windows\System32 or to directory where your System32 folder is.

4. Write in the search cmd and run it as administrator

5. Then use command: psexec -s -i regedit.exe

6. Now go to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BTHPORT\Parameters\Keys

7. From \Keys you can find your paired bluetooth devices. First there is the devices bluetooh mac address and 32 numbers long linkkey. Now write those linkeys and mac addresses up or copy them.

8. Now everything is set on Windows side. Next boot to android.

9. On android you need again for example ES file Explorer and R/W rights

10. With file Explorer fro root go to /data/misc/bluedroid/

11. Open file called BT_config.xml

12. From text find your devices using mac address

13. When you find you devices mac addres scroll down and you should see line with linkkey and 32 number code.

14. Now take that 32 number code you got from Windows

15 You have to change it little so the linkey works and here how it's done:

for example your Windows linkkey is "12345678qwertyuiasdfghjkpoiuytre" now set it as 8 number clusters like this

"12345678 qwertyui asdfghjk poiuytre"

Now you have to reverse those 8 number clusters

Take the set on far right "poiuytre" and mark it like this "po iu yt re"

Now reverse those pairs like this "re yt iu po"

Now "reytiupo" this is the first line in the new linkkey

Do the same for other three cluster. After it's done this example linkkey looks like this "reytiupojkghdfasuityerqw78563412"

16. When you have your modified Windows linkkey ready you can just replace the old one from the file BT_config.xml

17. Now just reboot android and your keyboard and mouse should work.

I've found that sometimes when switching from Windows to android bluetooth doesn't connect. Just reboot android and your bluetooth devices should connect.

I would have posted this on deveopers site where people visit more often but you need 10 posts and this is my first one so if you can you should link my post there so more people can enjoy these instructions.

Thank you for reading this and don't forget to like it :good: