Category Archives: Tips

Using Lightning-to-USB-Adapter to copy photo from USB drive to iPhone/iPad


Using Lightning-To-USB Adapter to copy images from USB Flash Drive to iPhone/iPad:

  • Requirement:
    • All image files need to put in a folder name: DCIM
    • Image files must have a filename with exactly 8 characters long (no spaces) plus the file extension (i.e.,; DSCN0164.jpg).
  • How to copy file:
    • If connected iPhone/iPad sees the flash drive, it’ll open all photos in thumbnails. You cannot view more than thumbnails off the drive. To see them bigger, you must import them.
    • Select to import few photo or import all photos.
    • Once you import, pay attention to the dialogue boxes because it’ll offer to delete the photos from the flash drive for you.
    • (You can not export photo from iPhone to flash drive).


Service Registration and Cancellation via SMS for Mobile Phone Service in Vietnam

Service Registration and Cancellation via SMS for Mobile Phone Service in Vietnam (Đăng ký hoặc hủy các dịch vụ giá trị gia tăng của điện thoại đi động bằng SMS):

1. Viettel (Customer Service Operator: 1800-8098)

  • Check currently register services (kiểm tra các dịch vụ mất tiền đang đăng ký): 
    • Viettel: SMS “TC” send to 1228
  • 1.2. Roaming (chuyển vùng quốc tế):
    • Register: sms “CVQT” send to 138
    • Cancel roaming: sms “HUY” send to 138  (when receiving confirmation sms, send “DONG Y”).
  • International call (gọi quốc tế):
    • Register: sms “QT ON” send to 133
    • Cancel service: sms “QT OFF” send to 133
  • Miss-call Alert MCA service (Thông báo có cuộc gọi nhỡ):
    • Register basic package: sms “DKC” send to 193
    • Register advanced package: sms “DK” send to 193
    • Cancel service: sms “HUY” send to 193
  • Data service package (3G service – dịch vụ 3G): 
    • Mobile Internet 3G charge: 

Package Name

Subscription   (d/month)

Free usage limit

Limit before changing speed

Fee for exceeded usage



















Unlimited (Không giới hạn)

600MB/month (tháng)




Không giới hạn





Không giới hạn



 (Effective on 16/10/2013)

2. Vinaphone:

  • Check currently register services (kiểm tra các dịch vụ mất tiền đang đăng ký): 
    • Vinaphone: SMS “TK” send to 123

3. Mobifone:

  • Check currently register services (kiểm tra các dịch vụ mất tiền đang đăng ký): 
    • Mobifone: SMS “KT” send to 994

Install Mac OS X 10.11 (El Capitan) and xCode on VirtualBox


  • VirtualBox:
  • Download Mac OS X El Capitan 10.11 via torrent
  • Download xCode from AppStore (inside virtual Mac OS)
  • GPX File editor: Adze Lite (for Mac OS) (download from AppStore)




Chọn kính thiên văn khúc xạ hay phản xạ?

Câu hỏi chọn kính thiên văn khúc xạ hay phản xạ thực chất là câu hỏi: ” Chọn thấu kính hay gương ? “

Đây là câu hỏi rất nhiều bạn thắc mắc khi có ý định mua hoặc tự làm một chiếc kính để phục vụ quan sát, thỏa mãn niềm đam mê của mình.

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How to get rid of the “Your upgrade to Windows 10 is ready” lock

Did you sign up for the Windows 10 upgrade, but change your mind? This may fix your Win7/8.1 updater

You signed up for the Windows 10 upgrade, but now that the bits are ready, you’re getting cold feet. I understand. But there’s one little problem: Your Windows 7 or 8.1 machine won’t install any updates until you install Windows 10. Windows Update may say, “Your upgrade to Windows 10 is ready,” and if you check for updates, you get “Windows Update cannot currently check for updates, because you must first restart the computer so that a previous installation can be completed.”

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Headphones + Speakers at the same time in Windows 7


Enable sound output on both speaker and headphone at the same time in Windows 7

  1. right click the Sound tray icon
  2. click Recording devices
  3. right click “Stereo mix” and click Properties
    (stereo mix is a “microphone” that listens only to sounds your computer makes.  It might called something different on your computer)
  4. click the Listen tab and check Listen to this device
  5. Now, if your Speakers are the default device, set “Playback through this device” to your Headphones (and vice versa: if your headphones are the default device, set it to your speakers).
  6. Click OK, OK, and it should work.


  • There is a signal lag (audio lag, audio delay) between computer Application and Bluetooth headphone. (i.e. when you what movie, you will see image runs faster than audio/sound).
  • If you don’t want such audio lag, select Bluetooth Headphone as the Primary/Default in Playback Device.

This setup is applied successfully to output audio to both (1) Xonar Audio Card to speaker and (2) Sony XB950BT Headphone via Bluetooth connection (wireless via CSR V4.0 Dongle). Software used are iTunes in Windows 7 Pro 64bit.

Source: [link]