I have a habit of keeping my computer system as up-to-date as possible, including Windows updates and hardware drivers, so when I noticed there is a new version of BIOS for my HP Envy laptop the other day, I started the update process right away without giving much thought about the potential danger of updating the BIOS. The download of the BIOS update utility was smooth and the update process completed without interruption. Supposedly, the computer should reboot to finalize the BIOS update, but unfortunately my computer stuck with a black screen. The power button was lit but the computer did not respond to any key press, thus I couldn’t enter the BIOS screen. I regretted for not thinking twice before the BIOS update and started panicking. The laptop has been three years old and out of warranty, and it will definitely cause me an arm and a leg to get it fixed by HP. With a little hope, I Googled to see if someone else had this problem before, and sure enough I am not alone. As a matter of fact, HP support site has a support article about how to recover the BIOS and apparently the black screen is caused by […]

HP Envy laptop black screen after BIO update


If you are in the Windows Insider Program and later on decided to opt out, you can choose to roll back to the last stable release you installed. However, the rollback may cause a very annoying error as show in the screenshot above: Selected boot image did not Authenticate. Press <Enter> to Continue. When you press <Enter>, you computer will shut down and the error repeats when you restart your computer. Based on my investigation, this seems to happen especially to HP computers, since my laptop is HP Envy, I got the exact error message after I tried to opt out Windows Insider Program and to roll back to the normal release. Well, the good news is that it is quite easy to fix it. Turn on the computer and enter the BIOS (press F10 for my HP Envy) Enable “Legacy Support”, and it will automatically disable “Secure Boot” (the secure boot causes the error) Ignore all the warnings about disabling the Secure Boot and save the BIOS saves, then reboot your computer Now you should be able to boot your computer. After reboot, go to Settings -> Update & recovery -> Recovery, the click “Get started” under “Reset this PC”. […]

Selected boot image did not authenticate error after rolling back ...



[Note]: I have fixed my computer and now it is running fast. See the end of the post for the update and the possible fix(es) of the issue. I have a habit of keeping my computer up-to-date as much as I can, so whenever there is an update of either OS or software I will get on it and install it. This habit, however, is a double-edge sword, while most of the time it will protect me from getting hacked, it can cause trouble sometimes, which just happened to me recently: my computer became sluggish after I installed Windows 10 Creators Update. After Microsoft officially released Windows 10 Creators Update on April 11, 2017, I couldn’t wait so I manually installed the update by using the media creation tool as suggested by Microsoft to those who are impatient to wait. The installation went well, but soon I noticed my computer seems to be much slower than before. It is not because I have a crappy computer, the specs of my computer is actually pretty decent: it is a HP Envy 15.6 laptop with Intel i7 CPU, 16GB RAM, 2GB Nvidia graphic card, 32GB SSD + 1TB hard drive. It has […]

[Fixed] Computer slows down after Windows 10 Creators Update


GPS spoofing refers to changing a mobile device’s GPS location by using special GPS app without having to physically go to the new location. It has been widely used by Pokémon GO players yet Niantic has not done enough to prevent GPS spoofing. Besides the ability to fake device’s GPS location, some GPS spoofing apps also provide a “joystick” feature that enables Pokémon GO players to “walk” to virtually any location on earth without having to move their lazy butt, so they can “go” to any PokéStop to collect items, or “go” to a PokéGym to battle while sitting in a couch. Thanks to GPS spoofing and Niantic’s lack of action, spoofers can easily control PokéGym and level up their trainers at a fast pace. If you play Pokémon GO, you can easily spot those cheaters: they have incredibly high-level Pokémon, for example 3K+ Blissey, 3K+ Dragonite. These Pokémon are very rare to get (usually by hatching 10K eggs) and even if you are lucky enough to get one, you will need to walk hundreds of miles to earn enough candy to evolve and level up to 3K, but with GPS spoofing, it is easy. Let me explain why. Some GPS spoofing app […]

GPS Spoofing is a big issue in Pokémon GO



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In my previous posts, I introduced two Linux distros for new users: Zorin OS and elementary OS. Zorin OS provides a Windows-like interface and elementary OS provides a macOS-like interface, with the hope of making both Windows users and macOS users feel less intimidated when switching to Linux. According to the Linux distro watch, both Zorin OS and elementary OS are getting popular. In 2016, Zorin was ranked No. 7 while elementary was ranked No. 8, and in last 3 months (at the time of writing this post) both them are still in the top 10 ranking. However, if you are like me who have used Linux for a while, then you might want to try Linux Mint which is currently the most popular Linux distro. Linux Mint is Ubuntu-based and has an elegant desktop environment and user interface. The installation is very straight-forward like the installation of any other Ubuntu-based distro and I had no trouble installing it on my VirtualBox, so I will not talk about the installation today, but I will discuss a common issue if you run Linux Mint on VirtualBox. When you install Linux Mint on VirtualBox with the default settings, then when you launch […]

Linux Mint running in software rendering mode on VirtualBox


In my previous post, I introduced Zorin OS, a Linux distro that can help Windows users to switch to Linux. Today I will introduce another Linux distro that targets macOS user to help them to switch to Linux and it is called elementary OS. This Linux distro has an elegant design with a beautiful macOS-like user interface so Mac users will feel comfortable to use it, although it claims to be a replacement for both Windows and macOS. Without further ado, let’s get started. First, let’s go to elementary OS website to download the latest official ISO image file. https://elementary.io/ Here you can choose to make a donation then download, or enter 0 in the Custom text box then click Purchase to start downloading the installation image file. Secondly, burn the image file onto a DVD disk, then insert the disk in your computer’s DVD drive and boot your computer from the DVD drive. Since elementary OS is Ubuntu based, so the installation process is very similar to the Ubuntu installation process and you will just need to follow the on-screen instructions to complete the simple installation process. Here are some screen shots of the installation in VirtualBox. You see it looks […]

elementary OS helps user to switch from macOS to Linux



A new version of Pokémon GO was released yesterday with many new update and the most exciting update is the addition of over 80 additional Pokémon. Even though I have not caught any Pokémon as shown in the promotional picture above, I did catch some very cute new Pokémon such as Sentret, Hoothoot, Noctowl, Spinarak, Snubbull, etc. This update also added two new Berries: Nanab Berry which can calm down a Pokémon, making it less erratic and Pinap Berry which makes the Pokémon drop more candy. Players were excited about the new addition of the Pokémon family and were trying to catch the new Pokémon as soon as the game was updated, and I was one of them and it is not surprising that I experienced game lagging yesterday. From yesterday until the time of this writing, here is the list of Pokémon I have caught: Furret Houndour Sentret Snubbull Shuckle Houndour Hoothoot Murkrow Ariados Natu Teddiursa Sunkern Spinarak Pokémon GO generated about $1 billion for Niantic 7 months after its initial release, and I think this new update will bring in more cash than any other previous updates for Niantic. Here are some reasons: 1. When Pokémon GO was first released, there were only 250 Pokémon included, so by default each […]

The world of Pokémon GO has expanded with 80 more ...


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I am not going to waste on explaining what Linux is, why/how to use it. You can Google it and you will find so much information online. Because Linux is open source and everyone can modify and contribute to it, there are many versions of Linux, and each version is called a Linux distribution, or distro in short. If you are not happy with Microsoft Windows OS but don’t want to switch to an expensive Apple computer, you can definitely give Linux a try. This being said, however, there are so many different Linux distros with different desktop environments (desktop environment is a graphic user interface on top of Linux so user does not have to use command line, like the Windows interface over the old DOS prompt), and most of the desktop environments are very different from the Windows or MacOS interface, so it is a daunting job to find the best distro for a new user. The good news is there are some special Linux distros especially developed to ease the pain of switching to Linux from Windows or MacOS. Here I will show you a Linux distro called Zorin OS which is designed to help Windows users to switch […]

Zorin OS helps users to switch from Windows to Linux



Since its initial release on July 6, 2016, Pokémon Go has generated more than $1 billion of revenue worldwide, according to Sensor Tower. You might be curious how Pokémon GO make money because there is no ads in the game. Well, it makes money via the in-app purchase. Like all the other mobile games with in-app purchase option, you can play and enjoy the game totally free, but if you want to level up and get strong quickly, then you will find that the in-app purchase is the your best option. This being said, however, there are some tricks that can help you to level up your Pokémon GO game quickly without paying a penny, I call it to “play Pokémon GO the smart way”.  Let me show you how to do it. First of all, you need to remember that the trainer level in the game is very critical and you need to upgrade your trainer level as high as you can and as fast as you can. Your trainer’s level not only determines how strong your Pokémon can be, but also determines what eggs you can collect from Pokémon stops, and what Pokémon you can capture in the wild. For instance, a low […]

How to play Pokémon GO the smart way


The Windows Registry is a critical and essential part of the Windows operating system and stores low-level settings for both the OS and the applications, such as device drivers, services, security settings, and so on. It is intended for advanced and experienced users to modify the system especially when there is no other way to do it,  because modifying Windows Registry may cause your Windows system not to operate and even crash. Therefore, normal users are not encouraged to touch the Windows Registry, and if they must, then it is highly recommended to backup the whole Windows Registry before any modification. I don’t usually touch the Windows Registry even though I consider myself an experienced and tech savvy, but today is one of those days that I must modify the Windows Registry to change the name of the network adapter created by VirtualBox. There is no need to explain why I need to make the change because it is not relevant to the topic and I don’t want to waste your time on it. Anyway, when I tried to modify the value of the registry key, I got an error: Error Editing Value. Cannot edit FriendlyName: Error writing the value’s new […]

Regedit in Windows 10: error writing the value’s new contents