Category Archives: How-To and Fix-It

Manually Create a Bootable UEFI 64-bit USB Flash Drive (Windows 7, 8, 2008, 2012)

  1. Create bootable USB:
    • Open CMD (with runas administrator), and use the following command to create bootable USB:
      • diskpart
      • list disk  (to verify which disk is the USB)
      • select disk # (select the USB disk)
      • clean
      • create partition primary
      • format fs=fat32 quick
      • active
      • assign
      • exit
    • Copy all file from Installation CD/DVD to the USB. It should be already bootable for 32-bit.
  2. Make UEFI (64 bit) bootable:
    • On the USB flash drive, “copy” the efi\microsoft\boot folder up one level into the efi folder as efi\boot.
    • Use 7-zip to Open sources\install.wim on the USB flash drive,
      • Go to: \1\Windows\Boot\EFI\bootmgfw.efi
      • Copy bootmgfw.efi to somewhere (e.g. desktop), then close 7-zip
      • Rename the bootmgfw.efi into bootx64.efi.
      • Copy/Move the renamed bootx64.efi file into the efi/boot folder on the USB flash drive

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).


Brenizer Method to create more shalow DoF

In this tutorial video they will demonstrate how to prepare images in Lightroom for achieving the Brenizer method to enhance shallow depth of field, and how to finish off the merged image with stylized editing in Lightroom after the “heavy lifting” is done.

Click here for the full article:…

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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