According to this site, the latest version of iOS supported by the original iPad is 5.1.1, so the answer is that within the constraints of the question (no jailbreaking, etc.) you can't upgrade beyond 5.1.1. Sorry.
Those who wish to install the iOS 7.1 update on their iPhone, iPad or iPod Touch can use one of the three available methods: via Over-The-Air (OTA), iTunes or using firmware file. iOS 7.1.2 Update Released [IPSW Download Links] iOS 7.1.2 has been released by Apple, available for all iPhone, iPad, and iPod touch devices that are compatible with iOS 7. The update includes multiple bug fixes and security updates, and is recommended for all users to install. Additionally, an update to Apple TV versioned as 6.2 is available. How to upgrade to iOS 8 (and downgrade to iOS 7 if ... - Macworld iOS 8 is here, and you're probably itching to give it a spin. Here's how to do so safely and completely. Plus: How to go back to iOS 7 if you don't like the new OS.
Can I Update iPad 1 On iOS 5.1.1 To iOS 7? Even with your iPad 1 running an iOS 7 skin, however, you will not have the entire look that you want. For one thing, the iOS 7 skin for my iPod Touch 3G does not have the proper iOS 7 YouTube icon (but you can create this using iFile), nor does the clock have the real-time animation that the iOS 7 clock app does. These may be minor disappointments, but few will notice them from a distance. how to get / install iOS 7 - 8 on iPad 1 generation - 100% ... Установка "кастомной" iOS 9 на iPad 1 (прошивка iPad 1 с iOS 5.1.1 на iOS 9) - Duration: 8:25. Эпичный Харьков 37,307 views 8:25 How to get iOS 8 on iPad 1 [1st generation] - Tutorial ... GET iOS 9 on iPAD 1 : https://youtu.be/4C-BL1rPZJo Sorry for the bad quality of the video. Anyway this video is on how to install iOS on iPad 1 (the first iPad). can i update my ipad 1 ((a1219)) to ios 7… - Apple Community
How to Upgrade iPhone, iPad and iPod Touch to iOS 7.1 [Guide] iOS 7.1 has recently launched and features many bug fixes in it. As there were some bugs like iOS music app and home screen crashing; these bugs and similar to them ... upgrade IPad 1 | Tom's Guide Forum iPad 1 won't run the newer iOS, and if you managed to get it installed, it will run very slowly. If you do a web search for the term jailbreak you will find tons of info. iOS 7.1 | iPhoneAddict.fr
A number of iPad users are reporting sluggish performance; acting slow, keep crashing / freezing frequently, lagging response; following the installation of iOS 7. Is your iPad running slow, then consider the tips below.
IOS | iSkysoft Here's everything you should know about iOS, including news, useful tips, troubleshooting, top apps for iOS devices and more. iOS 7.1.1: Unable to Update, Troubleshooting Issues and More | Here's all you need to know about iOS 7.1.1, troubleshooting/fix any problem you face when updating your iPhone/iPad to iOS 7.1.1 and more. Apple iPad mini Wi-Fi Cellular 64GB Black (MD542SL/A) | MALL.CZ iPad mini nabízí 7,9" displej o rozlišení 1024×768 px, procesor Apple A5 s 64bitovou architekturou, kapacitu 64 GB, GPS. Velmi příjemnou hmotnost – jen 331g. Komunikace je možná přes Wi-Fi, 3G/4G (LTE) sítě a Bluetooth.